Headlights

Lights, camera, Electra. Light up your life and your bike. Increase safety while riding by strapping these lights to your bike. Brighten up your bike and guide your ride. - Easily attached and removed with rubber strap - Low power indication - Waterproof design - USB chargeable - Weight: 20g

Compact cycling light with a machined aluminum body. A bright, single LED system provides up to 400 lumens and a Daytime Flash mode. Battery runtime has increased by 2.5 hours for up to 20 hours of runtime. It features eight output modes and cutouts for side visibility. Charging is simple with an integrated cable-free USB stick. It securely straps to a variety of handle bar shapes and sizes. Specs - Max Lumens: 400 - Weight: 83g - Max Runtime: 20 hours - Recharge Time: 2:30

Garmin Varia UT800 Meet the smart headlight that shines brighter for longer - High-intensity cycling headlight for urban and trail use that’s visible in daylight from more than 1 mile (1.6km) away - Projects a steady blast of 800 lumens for up to 1.5 hours - Automatically adjusts to ambient light conditions, speed and ride profile to extend battery life - Works independently or pairs with compatible Edge cycling computers to automatically turn lights on or off, control brightness and more - Offers 5 light modes, including high, medium, low, night flash and day flash Specs: - Dimensions (LxWxH): 3.8" x 1.3" x 1.2" (96.6mm x 33.5mm x 29.7mm); 1.8" with flange (44.7mm with flange) - Weight: 4.6oz (130.0g) - Battery life: 1.5 hours, high; 3.0 hours, medium; 6.0 hours, low; 25.0 hours, day flash; 6.0 hours, night flash - Lumens: 800 - CREE LED: yes - Degrees of visibility: 270 degrees - Visibility distance: 1 mile (1.6km) - Water rating: IPX7

Elevate your cycling experience with the Micro Drive 800+ Front light. Whether you ride recreationally or in challenging conditions, this is your visibility solution. With eight LEDs, this light is engineered for maximum efficiency and runtime, providing the best beam pattern for optimal visibility in even the most challenging conditions. Six different output modes, including Daytime Flash, 800 lumens max output, and a 35-hour runtime on femto mode, ensure you're prepared for any circumstance. The light's waterproof USB-C charging(cable not included) and CNC-machined aluminum construction with cooling fins provide durability and convenience. Rigorously tested to IPX7 Waterproofing standards, it is built to withstand various weather conditions. The fresh optical design, optional GoPro mount compatibility, and Infinite Light Power Pack+ compatibility offer versatility and enhanced performance. Customize your lighting experience for your unique lifestyle with the Micro Drive 800+ Front light. - Max 800 lumens / 35-hour max runtime - Max 800 lumens / 35-hour max runtime - Waterproof USB-C charging port with charge indicator - Daytime Flash mode with Highly Disruptive Pattern - CNC-machined aluminum construction with cooling fins - Engineered Optical Design - GoPro mount available separately - Infinite Light Power Pack+ Compatible for extended run times - Rigorously tested to IPX7 Waterproofing standards - 1900 mAh battery capacity

A powerful front bike light with a wide beam that illuminates any road or trail and can be seen from 2km away as a daytime running light. Ride with confidence, day or night, with the Ion Elite R Front Bike Light. This USB-chargeable light features a powerful beam with a wide pattern perfect for the road, path, or trail. Designed to offer lumens that last, Ion Elite R lets you ride longer with sustained brightness and features five modes including day flash for use as a daytime running light. - Ion Elite R provides a powerful beam that lights up the full width of any road or trail - A warm, wide 1000 lumen beam allows confident night riding - Specifically designed focus, flash, and range flash patterns offer ultimate daytime visibility - Long-lasting brightness exceeds industry standards - 1000lm-1.5hrs, 650lm-3hrs, 350lm-6hrs, night flash-26hrs, day flash-22hrs - Adjustable hard mount attaches securely to handlebars between 25.4-35.0mm - Blendr compatible with available helmet mount - Includes an adjustable hard mount and micro USB charging cable - Battery: 5000Li-Ion - Weight: 187g

A compact and powerful USB rechargeable front bike light that's daytime visible from up to 2km away. SMALL BUT MIGHTY A daytime running light is the easiest and best way to keep riders safe and visible. The Ion 200 RT provides the proven safety of a daytime running light in a compact and powerful USB rechargeable package, and it features a distinctive flash pattern that's visible from up to 2km away. PRODUCT DETAILS - Specifically designed focus, flash, and range offers ultimate daytime visibility - 200 lumens via high-power CREE LED - Integrated light sensor auto-adjusts brightness to your environment - 200LM-1.5hrs, 100LM-3hrs,5LM-14.5hrs, Night Flash-30hrs, Day Flash-12hrs - Easily attaches to your handlebars, helmet, or bike mount - Blendr compatible for simple, secure attachment to compatible stems and helmets - Connect with compatible ANT+ devices for always-on, battery status, and wireless control - Includes Ion 200 RT, front Quick Connect bracket, and Micro USB charging cable

Lights, camera, Electra. Vintage look, modern personality. The Electra Retro Headlight provides plenty of light in front of your bike, no matter what time of day. Light up your life—and your bike. - Bright and efficient LED element - Includes brackets to mount on fork crown and four AAA batteries - Low battery indicator - StVZO compliant

Engineered to be seen day and night, the incredible sleek Hotrod™ Front 110 emits a powerful 110 lumens of wide beam brilliance. Its continuous array of white LEDs penetrate broad daylight and the dark roads at night with powerful flashes and an extra-wide radiant glow. Every bit the road cyclist’s light, it uses a low-profile flexible mount designed for most handlebars including aerobars. - Powerful 110 lumen white light with 6 light modes - Built-in 24/7 Safety Technology® gives you a powerful selection of night and day modes (High - Low - SteadyPulse® - Low Flash - DayLightning® - Zoom) - SteadyPulse® mode features a steady beam to help motorists gauge their distance while overlapping pulses keeps them alert - DayLightning® mode emits lightning-like flashes to highlight your presence in the brightest of daytime hours - Zoom mode signals those around you with gentle changes in brightness - Continuous array of LEDs work in unison to illuminate an extra-wide and powerful glow - USB rechargeable Li-ion battery - Low battery indicator - Light mode memory saves the mode you're in before the light is turned off - Ultra low profile, water-resistant design only weighs 29 grams - Versatite™ flexible mount conveniently attaches to most handlebars including aero bars RUN TIMES: - Low Steady: 100 hrs - High Steady: 1:30 hrs - Low Flash: 30 hrs - DayLightning®: 3:30 hrs - SteadyPulse®: 6 hrs - Zoom: 6 hrs - CHARGE TIME: 3 hrs - MOUNTING: Flexible mount for seat post/seat stay - BATTERY: Built-in Li-ion - SYSTEM WEIGHT: 29g *Features and specs are subject to change without notice.

NiteRider understand lights are an integral part of your daily commute. Using a light can mean the difference between being seen or not by automobile drivers. Many of the “entry level” commuter lights are nothing more than “be seen” lights. Your overall safety and visibility should not be limited by your budget, that's why NiteRider created the Mako Series. The Mako line offers four models and up to 250 lumens, not only allowing the cyclist to be seen, but allowing the cyclist to see as well. The Mako line is easy on the wallet and easy to operate. - Low cost, high powered light - Highly visible in traffic = keeps you safe - 3 light settings – High, Low and flash - Tough durable design - Lumen Output: 250 - Run Time: 12:30 – 28:00hrs - Weight: 175g - Battery: Alkaline AA x 2 WARRANTY The Mako 250 is backed by NiteRider's lifetime warranty that covers any defects in material and workmanship, mechanical components (housings, covers, mounts and fasteners) and LEDs. SYSTEM INCLUDES - LED Light Head - Handlebar Mount - 2 AA Alkaline Batteries

NiteRider Lumina Max lights light up the night and are daylight visible with Cree LEDs and Max Boost mode. They're high-powered and feature a rugged design made with Dupont fiberglass-reinforced plastic body with integrated aluminum heatsinks. Max series lights feature NiteLink wireless connectivity with the Omega 300 taillight. - NiteLink Wireless Technology allows the rider to pair and simultaneously power on/off the headlight and Omega EVO 300 taillight wirelessly. (Taillight sold separately) - Multiple light modes including varying Steady and Safety Flashes - Handlebar mounting (Up to 35mm) with Quick Release Tab for easy light removal - CREE LEDs—the highest-performing LEDs on the market - Compatible with NiteLink Wireless Remote Switch (Sold separately) - Lumens: 2500 - Battery: Li-Ion - Recharge Type: USB

The perennially popular Spok is a commuter classic. It’s the bicycle safety light that’s sleek, compact and super functional. It straps to everything including bars, helmets and hubs. It’s a great light to have for those unexpected night rides because it keeps you illuminated no matter where you mount it.

Featuring dual-zone optical lenses, aluminum cooling fins and an external power pack, the Recon+ HL 1400 boasts the same technology as the Recon HL 3000 and HL 4500, our most powerful Recon head lights yet, projecting a super-bright wide-angle beam for up to 250 meters." - Three super-powerful LEDs from world-famous manufacturer OSRAM - Dual-zone optical lens delivers wide angle beams to illuminate side zones and a strong focused beam for the center zone - Anti-Glare TIR lens for powerful illumination that doesn’t blind oncoming traffic - Four different lumen output steady-beam modes and one flash-beam mode for variable use and run time - Supplied with Recon+ handlebar mount wireless remote control - Five easy-to-read LED power indicator lights display current power or recharge status - Durable CNC-machined aluminum casing for maximum heat dissipation. - USB-C charging port - Rated IPX7 waterproof

The Dice Duo is the smallest USB rechargeable light capable of changing from a white headlight to a red tail light at the press of a button. Designed for the road, this cubic inch light can turn from an impressive 110 lumen headlight to see, to an attention-grabbing 30 lumen tail light to be seen. Its adaptable flex mount can easily strap to handlebars or seat posts in a snap, even aero styles. For premium safety, its Adaptive Flash technology senses day or night, automatically switching to the optimal flash mode to maximize your visibility. Made for road cyclists and commuters, the Dice Duo is a powerful headlight and a tail light rolled into one. Performance - Functions as 110 lumen bicycle headlight or 30 lumen tail light Technology & Safety - 2 in 1 technology allows you to switch from headlight to tail light just by holding the power button for 3 seconds. - 8 headlight and 8 tail light lighting modes engineered for use on roads and commuting - Headlight mode: Boost, High, Medium, Low, SteadyPulse® Low, SteadyPulse® High, DayLightning® Triple Flash, DayLightning® Single Flash - Taillight mode: High, Group, Single Flash-Day, Triple Flash-Day, SteadyPulse® -Day, Single Flash-Night, Triple Flash-Night, SteadyPulse® -Night - SteadyPulse® mode alerts motorists with attention-grabbing pulses while its overlapping steady beam constantly lights your way at night - DayLightning® mode emits lightning-like flashes to highlight your presence in the brightest of daytime hours - Cycling Tuned Optics expands your field of vision with an extra-wide and long-range beam compared to typical lighting optics - IP64 water-resistant design for use in all weather conditions - USB rechargeable internal battery lasts up to 90 hours - Light mode memory saves the mode you're in before the light is turned off - Low battery indicator alerts you when a charge is needed RUN TIMES: Headlight mode: 1 hrs to 40 hours Taillight mode: 1:45 hrs to 90 hours CHARGE TIME: - 2 hrs MOUNTING: - Flexible mount easily adjusts to fit on handlebars and seat posts including aero styles BATTERY: - Built-in Li-Ion SYSTEM WEIGHT: - 30g *Features and specs are subject to change without notice.

The Fusion Drive Pro 600+ Front is a budget-friendly, feature-packed cycling light designed to elevate your riding experience. It provides powerful and long-lasting illumination with a maximum output of 600 lumens and a runtime of up to 36 hours. This light offers six output modes, including highly disruptive Daytime Flash ensuring maximum visibility during daylight hours, and the intelligent Power Indicator displays battery runtime. The CNC-machined aluminum construction with cooling fins guarantees durability and efficient heat dissipation, the fresh optical design enhances light dispersion, and the optional GoPro mount allows for versatile mounting options. With waterproof USB-C charging(cable not included), compatibility with the Infinite Light Power Pack+, and rigorous IPX7 waterproofing testing, this light is ready to accompany you on any adventure. - Max 600 lumens / 36-hour max runtime - Max 600 lumens / 36-hour max runtime - Waterproof USB-C charging port with charge indicator - Daytime Flash mode with Highly Disruptive Pattern - CNC-machined aluminum construction with cooling fins - Engineered Optical Design - GoPro mount available separately - Infinite Light Power Pack+ Compatible for extended run times - Rigorously tested to IPX7 Waterproofing standards - 1900 mAh battery capacity

The Zecto Drive 250+ Front is a low-profile, high-visibility light with six ultra-bright LEDs that offer up to 250 lumens of brightness. Its six combined solid and flash output modes offer versatile options for any situation. Its highly disruptive Daytime Flash mode ensures maximum visibility during daylight hours, and the intelligent Power Indicator displays battery runtime and increases side visibility. The light is fitted with a patented 2-in-1 clip and strap mounting system, allowing easy attachment to handlebars or loops. It is rigorously tested to IPX7 Waterproofing standards to withstand even the harshest weather conditions. With a 650 mAh battery capacity, the Zecto Drive 250+ Front offers a maximum runtime of up to 40 hours in Femto mode. It also boasts waterproof USB-C charging(cable not included), making it easy to keep it charged and ready to go. - Max 250 lumens / 40-hour runtime in Femto mode - Daytime Flash mode with Highly Disruptive Pattern - Waterproof USB-C charging port with charge indicator - 2-in-1 clip and strap mounting system (Patented) - Multiple mounting options like dog collars or strollers - Six combined solid and flash output modes - Rigorously tested to IPX7 Waterproofing standards - 650 mAh battery capacity

Packed with more power and technology than meets the eye, the new Dice™ HL 150 fires up the night with an incredible 150 lumens, and stands out in broad daylight with its intense lightning-like flashes. It even senses day and night, automatically switching to the optimal flash mode. Engineered for road cyclists, it uses a low-profile, flexible mount that's designed for most handlebars including aero bars. (Patent Pending) - Powerful 150 lumen output with 8 light modes - Built-in 24/7 Safety Technology® gives you a powerful selection of night and day modes (Boost - High - Medium - Low - SteadyPulse® Low - SteadyPulse® High - DayLightning® Triple Flash - DayLightning® Single Flash) - DayLightning® mode emits powerful lightning-like flashes to highlight your presence in broad daylight - SteadyPulse® mode alerts nighttime motorists with pulses while constantly lighting your path - Enhanced Cycling Optics™ (ECO) expands your visibility with an extra-wide and long-range beam - USB rechargeable Li-ion battery - Low battery indicator - Light mode memory saves the mode you're in before the light is turned off - Low profile, water-resistant design only weighs 30 grams - Flexible mount conveniently attaches to most handlebars including aero bars Patent pending. *Features and specs are subject to change without notice.

The rebirth of an iconic bicycle light, the Frog Front Bike Light: bright, versatile & fun. A design that millions of riders around the world have come to love. Powerful enough for everyday commuting or used to complement an existing lighting set-up. Taking cues from Knog’s more advanced lights, Frog is designed with Chip on Board LED technology, enabling a high intensity light that's compact, low profile and packed with features. - Punchy 40 lumen output - Integrated flexible mounting system - 9 eye-catching modes - Water resistant with IP65 rating - Super lightweight at just 20 grams - USB-C rechargeable (cable not included) - Curved lens provides side illumination - Battery level indicator - Up to 80 hour runtime - Simple one-button operation - Available in 6 fun-loving colours

- 2 pcs LUMINUS SST-40 high brightness LEDs - Max. Lumens: 2000LM (FL-1 tested) - Max.Runtime:160 hrs (FL-1 tested) - Battery Type: Li-Ion 3350mAh x 2(Quick release) - Recharge time: (2A: 4:00 hrs / 0.5A: 8:30hrs) - Weight: 207 g - Size L: 4.25" W: 2" H: 1.25:

The Hecto Drive 500XL is a compact, durable cycling light with a machined aluminum body with built-in cooling fins and cutouts for side visibility. Its single LED design provides an impressive maximum output of 500 lumens and eight output modes, including a Daytime Flash mode. Offering up to 20 hours of total runtime, charging is simple with an integrated cable-free USB stick, and the light straps securely to a variety of handlebar shapes and sizes. Specs - Max Lumens: 500 - Weight: 84g - Max Runtime: 20 hours - Recharge Time: 2:30 hours

The Beamer 3 is a classic that’s been keeping cyclists visible for 20 years. This affordable headlight delivers excellent run time and ample light so other cyclists, pedestrians, and drivers will always know where you are no matter how dark it gets.

Cut through the darkness with the newly designed Metro Plus™ 650. Sporting a refined, aggressive look, it emits a powerful 650 lumens on the road and trails providing long-range, extra-wide coverage to maximize your line of sight. Not only limited to night, the Metro Plus' DayLightning® mode makes you stand out in broad daylight to give you the advantage anytime and anywhere you ride. - Powerful 650 lumen output with 8 light modes - Built-in 24/7 Safety Technology® gives you a powerful selection of night and day modes (High - Medium - Low - SteadyPulse® - DayLightning® - Triple Flash - Zoom - Walking) - SteadyPulse® mode alerts nighttime motorists with pulses while constantly lighting your path - DayLightning® mode emits lightning-like flashes to highlight your presence in the brightest of daytime hours - Enhanced Cycling Optics™ (ECO) expands your visibility with an extra-wide and long-range beam - USB rechargeable Li-ion battery - Low battery indicator - Light activation lockout prevents accidental light activation - Light mode memory saves the mode you're in before the light is turned off - Rugged, water-resistant design only weighs 140 grams - Side illumination ports highlight your presence to nearby motorists - 2nd generation Locktite™ quick-release handlebar mount securely clamps to 22mm to 32mm diameter handlebars RUN TIMES: - Low: 6:30 hrs - Medium: 3 hrs - High: 1:30 hrs - Zoom: 4 hrs - SteadyPulse®: 4 hrs - DayLightning®: 12 hrs - Triple Flash: 19 hrs - Walking: 100 hrs - CHARGE TIME: 5 hrs - MOUNTING: Handlebar - BATTERY: Built-in Li-ion - SYSTEM WEIGHT: 140g *Features and specs are subject to change without notice.

This twin-beam bike light is bright! The Dual Blaze® 1500 utilizes two distinct beams of light to maximize lumen output and field of vision when you need to see the trail, path, or road. Two high ouput Nichia LEDs are powered by a Samsung 5000mAh lithium battery to deliver a whopping 1500 lumens of trail-blazing light. It's engineered with four settings so choose the power mode that best suits your cycling needs. We've added our famous Superflash strobe for daytime riding so vehicles are quick to notice you on the road from more than a half mile away even in peak daytime sun. - This twin-beam light provides 275 degrees of visibility while also delivering 1500 lumens - Nichia NVSW319BT high-powered LEDs provide high medium and low steady modes along with Superflash Day pattern - 3.5 hour charge time with included USB/USB mini

The Beamer 80 was born to be an urban warrior! It's super bright to light your way night or day. This compact light provides 80 lumens of high beam power along with Superflash and Courtesy modes. It packs a big beam but is small enough to stash in your pocket between stops. - High output surface mounted LED provides high power beam along with Courtesy & Superflash modes - FL1 Tested - Run times: 6.5 hrs (80 lm), 24 hrs (Courtesy -24-72 lm) and up to 70 hrs (Superflash - 80 lm) - Provides 130° of visibility - Water resistance rated to IPX4 standard - 2 AAA batteries (included) - A3 cam mount adjusts or removes without tools - 63 grams

Super bright and compact, Cateye's Omni 3 Front Safety Light uses CatEye's Omni Directional Technology for increased visibility. Three super-bright LEDs light up in three different modes so you can customize the pattern and extend the run time. Plus, CatEye's tool-free FlexTight mount makes installation easy.

The Micro Drive Pro 1000+ Front light is the ultimate companion for cyclists seeking unparalleled performance and reliability. With eight LEDs and a maximum output of 1,000 lumens, this light is engineered for impressive efficiency and runtime, providing the best beam pattern for optimal visibility in even the most challenging conditions. Plus, with an impressive 60-hour max runtime, you can rest assured that this light will last as long as you need it to. Its CNC-machined aluminum and highly waterproof construction with cooling fins guarantee durability. With seven unique output modes, including Daytime Flash, and waterproof USB-C charging(cable not included), the Micro Drive Pro 1000+ offers customizable lighting options for enhanced safety and convenience. Rigorously tested to IPX7 Waterproofing standards, it is built to withstand various weather conditions. - Max 1,000 lumens / 60-hour max runtime - Max 1,000 lumens / 60-hour max runtime - Waterproof USB-C charging port with charge indicator - CNC-machined aluminum construction with cooling fins - Engineered Optical Design - GoPro mount available separately - Infinite Light Power Pack+ Compatible for extended run times - Rigorously tested to IPX7 Waterproofing standards - 2800 mAh battery capacity

Highly advanced StVZO-certified e-bike cycling front light delivering 600 lumens of output. The E-Bike Fusion Pro StVZO E600 is housed in a CNC-Machined Aluminum body with extruded cooling fins ensuring durability, efficient heat dissipation, and an advanced computerized thermal management chip to maximize lumen output efficiency. The sleek and compact form factor of the Fusion Pro StVZO E600 looks great and delivers exceptional performance. Rigorously tested to IPX7 Waterproofing standards, it is built to withstand various weather conditions. It has an integrated 130 cm (51.2 inches) cable connecting to the e-bike's motor/battery system. The BES3 BOSCH connector and our e-bike center mount are included. E-Bike compatibility: 10.5 – 13.5V input, Max 9W. Our e-bike lights are powered by the motor/battery of an e-bike and need to be manually installed. Proper installation may require some disassembly of the bike and motor (depending on make and model, battery type) and additional wiring to connect the light to the motor. Please contact the e-bike or motor manufacturer for installation instructions. It is highly recommended to have a trained e-bike professional install your lights for you.

- Modes include High Steady, Medium Steady, Low Steady, DayTime Pulse, NightTime Pulse, and Economic Flash - Fully USB rechargeable: no batteries to buy or replace - Runtime up to 22.5 hours - Memory function: light turns on at the last mode it was turned off - Power saving function: 10% power or less, lights will automatically switch to lowest lumen output - Built-in battery indicators: RED = less than 25%, GREEN = fully charged

The MAGICSHINE Monteer 3500S offers up to 3500 lumens of max output as an MTB headlight. With smaller head and lightweight design, it is a good choice for various off-road ride, as a handlebar or helmet light. - Lumen: 3500 - Battery: 5,200mAh - Charging Time: 2.5-3 Hours - Waterproof: IPX 5 - Runtime: 1.5-75 Hours

- Supercharged 1:30 to 110 hour run time. - Extremely powerful 2,000 lumens in the most compact and stylish form - Cycling Tuned Optics throws a long range, extra wide beam to cover road and mountain biking. - Daytime visible flashes make you stand out on busy streets - Two-button design lets you fine tune the brightness and flash speeds to your cycling needs. - Expand run times beyond factory default settings by fine tuning the brightness modes and flash speeds. - 9 lighting modes for day and night use - SteadyPulse mode alerts motorists with attention grabbing pulses while its overlapping steady beam constantly lights your way at night - DayLightning flash mode bursts lightning-like flashes to make you stand out in broad daylight on busy streets. - 252 grams - IP67 water resistant for use in all weather conditions - USB rechargeable with 5 hours recharging time - Designed, engineered, and assembled in the USA.

Experience unparalleled illumination and versatility with the Lite Drive 1200+ Front. With eight LEDs, this light has a maximum output of 1,200 lumens and an impressive 60-hour max runtime, providing the best beam pattern for optimal visibility in even the most challenging conditions. Its waterproof USB-C 2A+ fast charging capability allows for convenient recharging(cable not included), while the CNC-machined aluminum construction with cooling fins ensures durability and efficient heat dissipation. The fresh optical design and the MOR(Maximum Optical Reflection) lens optimize light dispersion for enhanced visibility. With the optional GoPro mount and compatibility with the Infinite Light Power Pack+, this front light offers versatile mounting options and extended battery life. Rigorously tested to IPX7 Waterproofing standards, it is built to withstand various weather conditions. Choose from seven different output modes, from the attention-grabbing Daytime Flash Mode to the long-lasting 60-hour runtime Femto Mode, to suit your lighting needs. Illuminate your rides with confidence using the Lite Drive 1200+ Front. - Max 1,200 lumens / 60-hour max runtime - Max 1,200 lumens / 60-hour max runtime - Waterproof USB-C 2A fast charging - Daytime Flash mode with Highly Disruptive Pattern - CNC-machined aluminum construction with cooling fins - Engineered Optical Design - Infinite Light Power Pack+ Compatible for extended run times - 3800 mAh battery capacity