Li-ion 4000 8S1P 28.8v Battery Pack
- Nominal capacity: 4000mAh
- Nominal voltage: 8S 28.8 volts
- Maximum voltage: 33.6 volts
- Minimum voltage: 20 volts
- Recommended cutoff voltage: 24 volts
- Chemistry: Lithium-Ion
- Built with: 8 Li-ion 21700 cells
- Maximum continuous discharge: 35 amps
- Maximum charge current: 4 amps
- Watt hours: 115.2 Wh
- Energy Density: 203 Wh/Kg
- Main lead and balance lead wire length is 4.00" (custom lengths available upon request)
- 172mm x 25mm x 74mm, 578g
- Lifetime warranty
- Built today with factory fresh cells
- Engineered drawings available upon request
- Built with high-grade silicone jacket wire
- We install the connector and balance lead of your choice
Smart Battery Upgrade
- Lightest Smart Battery available on the market(adds less than 10 grams to the weight of the battery)
- Very small profile(adds less than 6mm to length of battery)
- SOC(state of charge)/SOH(state of health) gauge with momentary on switch
- Battery status indicator(fuel gauge)
- No power consumption while not in use
- Bright green/red LED lights for sunny days
Contact our Battery Tech Team for custom configurations or to request any additional functionality.
Lifetime Battery Warranty
MaxAmps offers a one-time, non-transferable lifetime warranty on any battery with a factory defect. Batteries that fail from improper storage or use error are not covered. Replacements only apply to products purchased from MaxAmps and does not cover any other loss.
- DO NOT USE WITH UNPROTECTED DEVICE
- ALWAYS USE A PROTECTIVE CASE OR BOX FOR STORAGE AND TRANSPORT
- BATTERIES MAY EXPLODE, BURN, OR CAUSE A FIRE IF MISUSED OR MISHANDLED
- ONLY use with proper protection circuitry
- DO NOT short circuit intentionally or unintentionally
- KEEP AWAY from metal/conductive objects to prevent short circuiting
- DO NOT use if battery, wrapper or terminal insulator is damaged or torn
- DO NOT over-charge or charge above the maximum voltage rating
- DO NOT over-discharge or exceed the continuous discharge rating
- DO NOT modify, disassemble, puncture, cut, crush, or incinerate
- DO NOT expose to liquids or high temperatures
- KEEP AWAY from pets and children
- ALWAYS charge in or on a fire-proof surface and never leave batteries charging unattended
- ONLY use a smart charger designed for this specific type of battery
- DO NOT mix and match brands and models, old and new, used and unused batteries
- STOP immediately if while charging/storing/using the battery it emits an unusual smell, feels hot, changes color or shape, or appears abnormal in any way
- It is your responsibility to determine that your charger or device is functioning properly
- If exposed to battery electrolyte, flush with water immediately and/or immediately contact a physician or emergency services
- DO NOT throw away in the trash; contact your local jurisdiction for proper recycling or disposal
If in the first 30 days, you are not completely satisfied, you can send your items back for a replacement or your money back. This does not include shipping charge and does not apply to custom built batteries. You pay the return shipping charge and we pay for the replacement to be sent to you.
For domestic US shipping, we ship via FedEx, UPS, or USPS. If you prefer a certain carrier, please specify in the notes on your order. We offer FREE Standard 3-5 day shipping on orders over $199 to US locations only. If you need it faster, contact us for 2-Day Express or Overnight shipping options. Because lithium batteries are considered dangerous goods, carriers do not guarantee overnight shipping, but they do offer it. In our experience, we have had a 90%+ success rate using overnight shipping.
For international shipping, we primarily ship via FedEx Priority but we also offer UPS Standard Ground to Canada. If your country is not listed on the website, we may still be able to ship to your country. You will need to contact us for a custom shipping quote. Be aware that our shipping costs cover postage and insurance on the package but not import costs such as duties, taxes, or broker fees.
Tracking details will be emailed at the time of shipment. Please allow time for the online tracking status to update.
We make every effort to ship within 24 business hours. If you need your order to arrive by a certain date, be sure to contact us directly and we will do our best to satisfy your request. For possible lost in transit shipments, please contact us immediately so that we can contact the carrier.
Some batteries must be shipped as fully regulated dangerous goods and will arrive to you with a 30% charge. We recommend charging up to 60-70% shortly after receipt. In addition, our lithium batteries have passed UN38.3 Testing making them safe for transport. This test summary can be viewed/downloaded via this link if needed.
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