Battery 101


Braun Oral-B replacement Toothbrush Battery 800mAh Li-ion with Solder tabs

An upgraded 800mAh Li-Ion battery compatible with specific Braun Oral-B electric toothbrush models utilising Lithium-ion technology. This compatibility extends to toothbrushes such as the Genius Pro Smart 4, 5, 6, X, 10000, 9000, 8000, 7000, Smart 6000, and several other Smart or Pro variants. To ensure compatibility, check for type numbers 3765, 3766, 3767, 3771, or 3772 located on the underside of the toothbrush handle.

Please note that this battery is exclusively suitable for replacing ONLY Lithium-ion batteries and should not be used in cases where the original battery are 1.2V Ni-Cd or 1.2V Ni-MH chemistry.

The battery is equipped with solder tabs, facilitating easy installation and soldering. To ensure a perfect match with your original battery, you may need to fold the tabs into the desired shape and then trim them accordingly.

Key Specifications:

  • Chemistry: Lithium-ion (Li-ion)
  • Voltage: 3.7V (compatible with 3.65V and 3.6V batteries)
  • Typical Capacity: 800mAh
  • Length: 49mm (compatible with 48mm, 49mm, 50mm, and 51mm long batteries)
  • Diameter: 14mm


Please note some older models are installed with different battery sizes and may have offset tabs which render this battery NOT a suitable replacement.

To ensure compatibility please open up your device and verify the size, voltage, and positioning of the Nickel tabs before placing an order.


Batteries will only have test charge. Ensure batteries are fully charged to reach full capacity. Failure to do so may lead to long term cell issues.

    We do NOT accept any responsibly for damage, injury or death caused by improper use of these batteries!

    • Do not overcharge! Ensure the charger voltage does not exceed the batteries stated full charge voltage.
    • Do not over-discharge! Ensure the equipment you use do not draw more current than the batteries “Maximum Continuous Discharge Current”.
    • Do not leave batteries discharged for a long period! Leaving Li-Ion batteries in a discharged state can incur irreversible damage – creating a loss in capacity and a loss in cycles.
    • Do not short circuit your batteries! NEVER short circuit Li-Ion batteries! Short circuiting can cause a huge surge of current that will potentially burn out your battery, damage your equipment, and even cause serious injury to you!
    • Do not let your batteries touch each other or other metallic items! Keeping your batteries loose, such as in your pockets, is a serious way to have your batteries fail and seriously harm you. There are battery holders and covers to keep your batteries safe.
    • Do not dispose any battery in a fire! There are dangerous chemicals in batteries. If you try to burn your batteries, they will release dangerous fumes and will probably explode. Always dispose your old batteries to a battery recycling centre.

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