EB4 36v 21Ah 750Wh eBike Battery

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  • $139.00
  • Regular price $350.00
  • 7 available
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Please read the description carefully.

Shipping to Lower 48 USA states via Fedex Ground ONLY. No international shipping including Hawaii, Guam, Puerto Rico. Non-USA customers click here.

Amazing 750Wh eBike Battery! Our EB4 36v 21Ah eBike Battery has a 750Wh capacity, containing x80 18650 lithium-ion cells. Great for building eBikes, on-the-go power storage, building Powerwalls, or for powering any other 36v devices requiring up to 21A. For higher amp applications, combine multiple packs in parallel (combine using 3x Amp Booster or 12x Amp Booster). The EB4 is equipped with a Battery Management System (BMS) that protects the battery cells. Pack is shipped with the BMS already awake. Storage box not included.

Connect x2 of these batteries in series to make 72v 21Ah 1512Wh. Connect x2 of these batteries in parallel to make 36v 42Ah 1512Wh.

Compared to the 625Wh, the EB4 750Wh pack gives you 20% longer range, making it perfect for long rides that require lots of mileage.

** NOTE: To get an accurate shipping price when buying more than x2 packs, email support@jag35.com

Battery Specs

  • Cell Chemistry:  LiCoO2
  • Nominal Voltage:  36 V
  • Nominal Capacity:  21Ah
  • Length:  16.5"
  • Width:  4"
  • Height:  4"

Pack modules contain blue EVE ICR18650 3.7v 2.55Ah cells or purple LGGBM26 3.7v 2.55Ah cells, some packs may contain another cell brand and color.


    2A charger sold separately HERE.
    Can also be charged with a fast charger (needs an XT90 connector). Make sure you fully charge the pack as soon as you receive it and before using it.

    ** NOTE: To get an accurate shipping price when buying more than x2 packs, email support@jag35.com

    Product video + usage recommendation:




    Additional Information:


    If your pack falls asleep, these videos show you how to wake it up: 


    If the BMS falls asleep, follow these steps:

    Awakened battery packs have blinking blue LED lights on the top edge, near the XT30 connector. If your packs have modules with no blinking blue light, that pack's BMS needs to be awakened. There are several ways to wake a BMS. The easiest way to wake this BMS is to fully charge the pack via the large discharge port, then apply voltage to the small JST PH 2.0mm 4-pin connector. The BMS LED light will turn from blinking slow red to blinking blue. See below for more instructions on waking up the pack's BMS. Obviously, the packs will not wake without charge. Charge these packs using the NEW 42V 1.7A BATTERY CHARGER + MU CABLE BY XIAOMI or this variable charger.

    Individual Battery Pack Module LED Indicator Lights

    • Blinking blue = BMS awake
    • Blinking red slowly = Battery charging
    • Blinking red and blue = Battery trickle-charging
    • No blinking light = Battery BMS asleep, needs waking
    • Blinking red fast = Potential BMS or cell problem

    Charger LED Indicator Lights

    • Solid red = Charging
    • Blinking red = Trickle charging
    • Green = Fully charged / Not charging

      When the charger is plugged into your battery pack you should see the charger's LED indicator light turn solid red and the battery pack's LED indicator light blinking red slowly. If you see the charger's LED indicator light blinking red (trickle charging) and the battery pack's LED indicator light blinking red & blue, leave your battery pack charging for an extended period of time until the charger's LED indicator light turns solid red. See video below for additional steps.


      These items are sold for DIY and Second Life purposes. Listings that are “untested” as sold as-is and cannot be returned, exchanged or refunded. Even when sold as “new”, “NOS”, or “like-new”, they may be in less than perfect condition.

      If you buy a product from us and then realize you don't have, or don't want to acquire, the tool(s) or information needed to make our product(s) work for your specific build, this does not constitute valid grounds for replacements, exchanges or refunds. You are responsible for doing your due diligence before making any purchases.