[100percentjake]

A friend of mine ended up with a large amount of Segway batteries that were "dead". I could immediately tell that the BMS had shut off so I bought a dozen of them off of him for a song and set to taking them apart. Applying a charging current directly to the batteries immediately woke the BMS up, and then plugging them into a 5amp charger resulted in a pulsing charge (2s on, 2s off) and one of the MOSFETs on the BMS got quite warm. I'm assuming this has to do with the stock charge current being 2.4a and the BMS shutting off charge once it sees excessive current. Charging two batteries in parallel results in the same behavior, however. I haven't tried three.

I also tried putting one in a Razor E300-HD (brushless) but my Kelly controller could only go as low as 20a draw, so after about 100 yards of riding the BMS would cut the fun. Going to reattempt with a clamp ammeter on the battery neg so I can see how much amperage it's actually cutting off at. My goal is to cram three of these in parallel under the deck of the E300HD and aim for 30 amps at 36 volts and see what happens to that poor hub motor.