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I would partially agree with that. The controller can be limiting the phase current it drives the motor with. Most of the motor softwares available use torque control algorithm where torque is proportional to stator current. Hence, the maximum torque depends on maximum phase current defined by...

Actually, even if the cells look to be out of balance with 0.1V difference, they still may have the same SoC because of steep V curve at low charge levels. I would be charging the whole string to see if the individual cell voltages will level up at above 3.3V.

I'd connect the bench supply to the whole string, with current limited to 100 mA. It will reach 32V in a few hours. After that, the BMS should be able to take charge in the normal way.

Looks good, where are you based? I'd come over to check it with an electronic load, cash on collection.

Actually, I have two Kalkhoff batteries successfully recovered exactly from that state. Both were forgotten in storage for some time until the BMS was no longer able to take charge. Recovered by trickle charging using a bench DC power supply. Don't know if any capacity was lost or not, but they...

... are exactly the main reason of the ongoing war in Ukraine. Some people call the opportunity of keeping bad guys' money "good investment climate"

Oh yes, please DM me!

Please check charger output voltage first: it must output 42V briefly when you pull down the "R" pin on the cradle with 10k. If no other load is connected, 42V will disappear and the charger will lit green.

Looking for an old Derby Cycle (Kalkhoff Agattu, Raleigh etc.) battery with 5-pin bottom connector noted as "-"+"C"D"R" and 4-pin XLR charge port. In any condition.

Out of curiosity, is the old battery still with you? I am looking for a donor to get BMS board from. Thank you!

Have you tried charging through the side port, or through the bottom pins using dock stand provided with some Kalkhoff bikes? Is your charger original, or an aftermarket one? Side port pin 1 is a signal wire for the BMS to indicate the charger is connected. Pin 1 goes to 0V inside the charger's...

Oh, nice to know. Would they be able to help on the following? I have an Integrale battery which does not engage the main switch, for an unknown reason. All other functions, including the housekeeping 12V output, are present. When I bypass the output MOSFETs, the motor works just fine, just as...

Yes pretty much, I had a successful few miles test ride yesterday. Since the bike was down for a week anyway, decided to get the motor overhauled, cleaned, re-greased with belray waterproof grease and painted over. This appeared to be done just in time, as the ratchet and the crankshaft roller...

Some more details:

So the root cause of the problem of the question mark being displayed instead of the charge level was the display not being able to communicate to the motor over the CAN bus. The culprits are below, the two small filter capacitors in the middle one of which gone short: The most tricky part was...

The clocks are okay, they run well without the main battery. Upon further investigation, I've found there's no communication with the motor. All menu settings that are motor related, return a comms fault. The battery is ok as well, tested with another Impulse unit. Will keep posted on the...

Hello, does anyone happen to know what a "question mark" means when shown instead of the charge level on Impulse Smart Display? I presume CAN bus connection to battery has failed, resulting in no assist from the motor. The bike is Kalkhoff Include with Impulse 3.0 Evo system Thanks!

Oh how right it is! You can't overestimate how owned we are by brands and supermarkets. Retail margins and cost of sales are ridiculous.

Hi there and sorry for late reply J Second and third blue charge indicator lights flashing mean your wheel magnet is missing / misplaced.

IMO, cell internal resistance is more important than Wh capacity. I use an electronic load to measure voltage drop under 300W instantaneous load. Cells' voltages should stay balanced in that condition - but the battery is to be opened to take these measurements