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Note that the switch to turn on/off the extra battery is goingn to be diffficult to find. ie it needs to be at least 48volt DC and 10AMP rated. Higher current is better. A 240AC (mains) switch is NOT going to be suitable - the DC current will cause internal arcing and will destroy it. In fact I...

I am of the belief that all parts of the Shimano system - motor/battery/handlbar controller - talk to each other over the eBus. Thus, I always assumed that removing the official battery from the system will not work - the system will shutdown. This is why in my solution the factory battery is...

Some more photos of the finished ensemble - the second battery is being charged hence the strange wire hanging out the front - the stock Shimano battery is stable at 69% SOC at this point = nice for longevity The power switch is not ideal. It goes "pop" sometimes when I turn it on = not good.

the basic premise that that The positive supply from the stock battery flows to the motor via a diode (anode 2) as does the second battery positive supply via anode 1. The common point of both diode outputs (the common cathode) then goes to the motor. Then: Either battery can power the...

I cannot really say as I have never pushed it until both batteries are flat. The second (cheap) battery is 11AH as is the stock battery so in theory double the range is possible. The next cheap battery will be a 15AH triangle pack - will fit the frame better. But I could also carry a third...

My setup is still running ok. The cheap second battery is still able to run the bike with little to no discharge from the main (Shimano) battery until the cheap battery gets down to 40 to 50% SOC. Then the Shimano battery starts to contribute to the motor power. The cheap battery is however...

Hi, New here. But others may be interested in an experiment I am running. A while back (2018?) I bought two Avanti Inc. E bikes - Avanti is a New Zealand Brand common in Australia and the inc E (at that time) was equipped with Shimano Steps 6000 drive line, hydraulic disc brakes, Alfine 8 speed...