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We can use our smart SOC boards for all the bananas, and the non-Brose plastic flat ones. We never tested with the metal ones, but probably okay too. On all BH bikes, the charger is 'dumb', it is only positive and negative. You can use the original charger co...

When the smart SOC board is attached to the battery, it can produce a decent spark: High (30-60V) battery voltage Uncharged input capacitor on DC/DC converter Inductance of the battery wires Without a limiting resistor, the current spikes to near...

On the original board, it is possible to pull the data output to 42V, and the current will be only milliamps. In fact, the whole signal will go up - the signal amplitude is max 3.3V or 5V or whatever. We don't do this. That could be the reason why we killed t...

Source: https://endless-sphere.com/forums/viewtopic.php?t=70198 Quote: An Arduino compatible board and a few discrete components Add a 5V source, i usually use a LM2596HV dc dc converter for this. A USB powerbank or even running it from two or three Cells on...

R = 10k Reading Yamaha communication II (13/08) Regarding the Yamaha battery from workshop with the BMS designed by ourselves, the same procedure for trying to read the communication has been tested, getting to the conclusion that the communication is ...

Purple trace: Yedlik board Green trace: original board We attached a 10k pull-up resistor to 3.3V to each battery's middle pin. 3.3V is supplied by separate desktop power supplies. Tuning the pull-up resistor value The original board's output amplitude i...

Setting up the test Turn the current off on the DC supplies before connecting the board, otherwise the spark might murder the DC/DC converter on the board The correct order: Make sure crocos are disconnected Give a little current Set up the desire...

The good thing about the Version 3.0 of our Yamaha Board design is that can fit both BJT and MOSFET transistors. In the case of using MOSFET's, the consumption goes lower and the quality of the signal is improved. However a part of the circuit must be changed...

This is the current waveform in one loop cycle. Higher current when SCI on Lower current when SCI off (it is actually sleeping) Let's determine the average. Imax = 21 mV / 10 Ohm = 2.1 mA Imin = 0.6 mV / 10 Ohm = 0.06 mA Ttotal = 265.6 ms T_Imax =...

Baseline Current consumption, with the transistors disconnected: 9.82 mA @ 30V 7.5 mA @ 42V Interestingly, if I put the Arduino to powerDown all the time, it still consumes 7.13 mA @ 42V. The RECOM RPMH-0.5 3.3V fix output DC/DC converter has only 16 ...

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...