The battery builders club

Im having a similar issue with a board/ charger. It greens lights at 48.08 and wont charge past. Replaced a bms already and same issue. Turn it on and the battery reads like 85%or so. So this coul be the charger? Anyway, also similar problem to a few posts up. Obviously in th following pic, the torn hole batteries that made an audible venting noise are trashed but how about the other ones where it’s only deformed

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To be honest I wouldn’t consider any of those usable because of how much it’s been pulled up

Maybe the top left, but either way, the nickel has not been removed very well

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I wouldn’t weld them in packs, my last attempt was not fun :sweat_smile:.

Maybe usable standalone in small gadgets tho.

I changed the battery of my multimeter which turned out to be almost dead.

The voltage is pretty much consistent with the data from the VESC.

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Still don’t know why it won’t charge past 48V.

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Hah! Called it!

I haven’t been following your saga, have you taken the pack out yet or not? Also, what BMS?

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You may have answered this before, but I don’t remember:
Have you left it on the charger for an extended period (hours or days) in case it’s a cell balancing issue?
Have you checked the p-group voltages?
If the groups are out of balance, have you checked to see if any balance current is flowing? (A DC clamp meter is nice for this)

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It’s a Daly it says 12S and 48V on it which is probably the problem dammit.

I haven’t got the time to open it yet

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I didn’t leave it on the charger for more than 30 min past the green light. This was the first time I plugged it to the charger, it’s a new pack I just finished. All the p-groups read 3.63 or 3.64 when I assembled them last week end.

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That’s the right BMS

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Is it supposed to charge to 50.4v?
Should I keep it plugged in?

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Have you checked all the groups to be sure?

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Not yet, I will open it tonight but they were balanced before the charge tho

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Also make sure your charger is actually outputting 50.4V if you haven’t already.

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Plug it to the wall and check at the output?

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Yeah

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Charger is good exactly 50.4v.

I’ll openthe enclosure tonight when the girls go to bed.

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Just finished soldering up my BMS harness on my 10s LTT smart BMS, now all I got left is the charge port and fuse. I’m wondering, does it need to be fused on the positive or negative? And will need to be on C- or B-? I’m trying to have it where it can monitor the cells and stop them from being completely drained (which I’m sure I can do a cutoff in the vesctool) and also stop them from being over charged

Doesn’t really matter which side you fuse. I like to fuse the positive so there’s always a ground, but that’s personal preference.

Should be connected to C-.

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Alright appreciate it. I have a fuse holder so I assume I connect the positive of the charge port to that, and the other side to the main positive on the battery harness

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