Got my first eskate, a tynee mini 3, and it has been a lot of fun riding it. Recently, I’ve been running into an issue where the board turns off when it reaches around 50% but the problem started when it first turned off at around 30% and it only turns on as soon as I charge it. The battery is a 13S2P with Samsung 30Q cells. I checked the battery’s voltage when it turns off and it was at around 39V. I contacted customer support and they were nice enough to offer me a molicel battery for an amazing price. I was just wondering if I could get some insight to what’s going on and what I could possibly do with it. Feel free to ask any questions!
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When fully charged the voltage sits at around 53V to 54V but it drops fast, around 90% charge it drops to 50V. Eventually it turns off at around 39V. I haven’t done a lot of testing tho this is as far as I know.
39V is probably the cutoff for the BMS (3v/cell). The battery percentage reader sounds like it’s not accurate. Full charge should be around 54V, 90% would be around 53V~. If they’re offering a P42A replacement I’d take them up on it.
Sounds like the battery could be unbalanced.
This could be an indication of a large safety issue.
But, without knowing a lot more information, it’s hard to say.
I would be suspicious of this battery being dangerous and wouldn’t use it or charge it.
OP only said “molicel”, they didn’t say P42A.
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Can you get to the bms ’ balance lead connector disconnect it, and carefully probe each cell group?
I’d guess 12 p groups will be similar and one far lower. with either failed welds or a failed cell within.
I ordered a 35$ non operational parts only 7s1p junk board. It would turn on, but cut out soon as throttle was pressed.
6 cells were 4.02v, one was 0.24v.
The 6 cells are my first spot welded battery packs, two 3s1p 11.1v nominal batteries i use for pocketable fans, Leds, or USB power source.
Their bms is not a balancing one.
The 2000mah 10amp BFN cells do drift apart after a dozen cycles, how much depends on how fast I drain and charge them, with speed causing more imbalance faster.
I inject 4.2v on the lower cells and monitor amperage acceptance via a JST connector to balance.
I’d like to emphasise “carefully”
It’s really, really easy to accidentally make a huge spark doing this.
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You should not charge cells that ever went under under 2.5V, they are trash.
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I know, that’s why I said P42A because if it’s something different I’d probably reconsider
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Not just trash, but also a potential fire hazard if charged up.