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Measurement setup Yamaha board V1, with only the Arduino Pro Mini and the RECOM 0.5A 3.3V installed. Supplied from a 42V battery Multimeter in line to measure current 100 Ohm series resistance on battery to act as a shunt to measure current w/ scope Sco...

This Yamaha battery we usually see on BH and Haibike. It has a very similar BMS to the Shimano bikes, for sure the same company. It even has the same SMD fuse! Discharge The middle pin needs to be paralleled to the positive output for discharge, a bit sim...

In many cases, the charge connector breaks on the Yamaha batteries, but the BMS is still okay. It is not possible to buy the original connectors. Our solution idea now is to swap the BMS, and go over to normal jack plug. This works, but it is a lot of work, an...

The greatest enemy of good soldering is a corroded tip. The hot tip will corrode very quickly. You must always keep it clean and tinned, and switch the iron off if you are not using it. Even if for a minute. We all know how one minute becomes ten. Generally y...

Reset If the cells are not in deep discharge, the problem will be that the BMS goes into a fault mode, and must be reset. Look at the clip here: https://www.youtube.com/watch?v=23SVz23RkbA Short version: Open Cut the tape up over the BMS Remove the sen...

These batteries have a dumb BMS that we can replace, and they have only 40 cells: 10s4p. The BH flat spacers fit it perfectly. It has 4 longggg M3 screws on both ends with PH2 heads. It is a bitch, because they are in narrow spots, so a PH2 screwdriver doesn'...

These batteries have 50 cells, 10 each in 5 layers. It has a non-generic BMS that is usually not problematic. The common problems are: Low capacity due to bad cells Dead cell group Bad turn on button Bad BMS Battery use guide When no LEDs are on, ...

GO SwissDrive went bankrupt in January 2019. The battery has a single Rosenberger connector that is uses for both charging and discharging. It is possible to do recell on them if the BMS works reliably. We do not have replacement BMS. Disassembly 5 screws...

If it does not charge, it can be reset by charging from the discharge. See photo for layout: Changing the button If you cannot see anything on the indicator, it can be because the button is water damaged. To have access, you must carefully peel off the st...

The wish from the customer is 17.5 Ah - 50 cells need to fit into the box! I remember having done this once - and the challenge was fitting the BMS in. This time doing it with dedicated design. Original battery 325 mm tall alu housing. On both ends, it nee...

The easy case: bicycles A BMS is supposed to keep track of each and every cell group's voltage. In bicycles, this can be easily solved with n+1 wires, where n is the number os cell groups in series. This is why the BMSs we buy from China have 11 wires for 10S...

Typical problems Corrosion Nothing to do, goes to recycling. Deep discharge Sometimes it survives being woken from deep discharge. Usually not. Bad BMS We cannot buy new BMS, but it is possible to swap BMS between identical batteries. ...

On the E80xxs, usually the charge connector, the discharge connector, or the BMS gets fucked. If it is one of the connectors, it must be replaced with original one from a bad battery. E8010 is 14Ah - 504Wh E8014 is 11.6Ah - 418Wh E8016 - 630Wh Open SUPER C...

Github repo for the finished software: https://github.com/gregyedlik/BT-E60xx/ The process is very similar to hacking the Shimano charger, but this time a bicycle is also involved. It seems like the bicycle sends a short message, and then the battery answe...

Just like on the BT-E6010. First, check that the following are true: The battery is in balance and not in deep discharge, nor is it fully charged When you plug in the charger, the LEDs on the battery start blinking at least for a few seconds as if it were...

With a Raspberry pi, you can send the same code as the charger would.. and the FETs close! :) Original Spoof Python code import serial import time ser = serial.Serial('/dev/serial0') ser.baudrate=9600 ser.parity=serial.PARITY_NONE ser.stopbi...

It is possible to transfer BMS between these batteries if done carefully. Take care that the power connectors are NOT identical on all of them! Some housings have 4 screws, other 6. They use different power connectors from the Bosch plug to the BMS, and you m...