The MAX17263 article is moved to

I am currently developing this device. It will be ready in begin 2020.


The battery dongle has two functions:

  1. A battery hack that let you mount any battery on a Yamaha e-bike, so not just a Yamaha battery
  2. A very accurate battery fuel gauge, so not just simple voltage measuring

Yamaha e-bike battery hack with very accurate Fuel Gauge
Yamaha e-bike battery hack with very accurate Fuel Gauge

1. Yamaha battery hack

As with other brands, the Yamaha motor blocks if another battery is connected, but this protection can be hacked. The Yamaha does not use encrypted authentication.

Example of use

On my solarbike, the Maxun One, I want to use a Yamaha PW-X2 mid-drive motor. The problem is that the Yamaha battery is not suitable for my solar bike because:

  • The PV panels can charge the battery with a current as high as 8A. Normal Li-ion e-bike batteries can’t stand this high charge current. I need LiFePO4 battery cells.
  • The battery must allow simultaneously charging and discharging, this isn’t possible with the Yamaha battery.

Battery authentication

As with all e-bike motor manufacturers, the motor blocks when another battery is detected than the same brand. Note that this is unallowed product tying, see my article Product tying.

Yamaha battery dongle development
Yamaha battery dongle development


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