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Pat911 · 02-04-2023, 02:09 AM

Ok then. Keep in mind the warning about shorting the pins.

Put the multimeter negative lead on the main post negative and start probing the pins. Being a Samsung battery I would “ASSUME” NMC chemistry, but I may be wrong. Depending on charge state, each cell will be somewhere between about 3v and 4v, even if it is LiFePO4. You should be able to identify each cell tap as the voltage will commence at the 3-4v for the first tap, then increase by the same amount for each successive tap. The last tap will be the same as the main battery positive voltage. You will find a few at 0v, one will probably be the battery negative and the others probably temperature probes.

Once you’ve identified which pin/wire is which you can use them to wire in a new generic BMS.

With the pins that measure 0v, you can turn the multimeter to ohms and identify which one of them is connected to the battery negative terminal.

Let us know how you go, reporting how many voltage taps you’ve found and the full battery voltage. This will help identify the chemistry and which BMS you should purchase.

02-04-2023, 02:09 AM	#19
Pat911 Gone Wild Join Date: Dec 2020 Location: Melbourne, Australia Posts: 1,947	Re: Ezgo txt fleet lithium battery Ok then. Keep in mind the warning about shorting the pins. Put the multimeter negative lead on the main post negative and start probing the pins. Being a Samsung battery I would “ASSUME” NMC chemistry, but I may be wrong. Depending on charge state, each cell will be somewhere between about 3v and 4v, even if it is LiFePO4. You should be able to identify each cell tap as the voltage will commence at the 3-4v for the first tap, then increase by the same amount for each successive tap. The last tap will be the same as the main battery positive voltage. You will find a few at 0v, one will probably be the battery negative and the others probably temperature probes. Once you’ve identified which pin/wire is which you can use them to wire in a new generic BMS. With the pins that measure 0v, you can turn the multimeter to ohms and identify which one of them is connected to the battery negative terminal. Let us know how you go, reporting how many voltage taps you’ve found and the full battery voltage. This will help identify the chemistry and which BMS you should purchase.