SINOPOLY 3.2V 100Ah LiFePO4 Lithium cell

Kit Elec Shop does not sell Lithium cells and batteries.
This original Sinopoly LiFePO4 3.2 V cell have a capacity of 100Ah.
The nominal voltage of the cell is 3.2 V and the operational voltage is 2.8 – 3.7 V.
The maximum charging voltage for initial charge is 3.8 V.
Recommended subsequent charging voltage is to 3.7 V.
The minimum voltage is 2.8 V.
The cell is capable to provide short time discharge current up to 5C or 3C continously.
There is no Selfdischarging effect – can be recharged at any state of discharge (no memory effect).

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More information's on the website www.ev-power.eu

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That was *after* that same pack had been accidentally drained to zero volts once before, and carefully recharged slowly back to normal, and then used for years again with no problems (though nowhere near their capabilities, as it was just for lights; the traction pack was separate). And after a short in the trike wiring caused a wiring fire on the stuff ocnnected to the same pack.

The reversed cell puffed up, but it's been in a file cabinet out in a shed for years since then, and nothing has ever happened with it. Never tried to do anything else with it since then, of course, so I don't know how it would behave if it were used (or abused) after what it's been thru.

None of the cells in any of hte packs have gotten hot, etc., under any usage I've put them thru (though I don't use them at their continuous C-rate of 5C, they do see that and more on some system configurations for peak power for a few seconds very regularly). The cells stay in balance, even drained down to empty (which I don't do on a regular basis, but have a ocuple of times), using just the pakc-level LVC in the Cycle Analyst to keep me from overdischarging them.

I had one cell of the original pack (oldest cells) increase in Ri and start sagging in voltage more than usual, so I swapped it out. I think I used it in the lighting pack above, and I think it is the cell that eventually reversed, but cant' remmeber anymore.


So while that's no guarantee of a cell's safety, it's a data point for consideration.


Personally, I think that any EV-grade cell like these, that are used in western-built EVs that have a lot of QC and original engineering qualification testing to ensure a cell is really well-designed and manufacturered, is perfectly safe to use as long as it is kept well within it's specifications, even without a traditional BMS. (for instance, just monitoring cell (group) voltages, to ensure no overcharge or overdischarge). Until they get "old", they are likely to be well-matched in characteristics and thus stay balanced on their own, and when they don't any more it is time to replace them anyway.

FWIW, Iv'e run the EIG NMC cells with no BMS the whole time I've been using them (years, in the hot Phoenix weather, trike always parked outside except at work just because of size), and have had only one cell "fail", by swelling up, and that was because i left the automotive halogen headlight/etc on and forgot about it until it literally drained the pack to death and actually reversed one of the four cells being used--and the headlight was *still on and lit up* (other three cells providing current).That was *after* that same pack had been accidentally drained to zero volts once before,and carefully recharged slowly back to normal, and then used for years again with no problems (though nowhere near their capabilities, as it was just for lights; the traction pack was separate). And after a short in the trike wiring caused a wiring fire on the stuff ocnnected to the same pack.The reversed cell puffed up, but it's been in a file cabinet out in a shed for years since then, and nothing has ever happened with it. Never tried to do anything else with it since then, of course, so I don't know how it would behave if it were used (or abused) after what it's been thru.None of the cells in any of hte packs have gotten hot, etc., under any usage I've put them thru (though I don't use them at their continuous C-rate of 5C, they do see that and more on some system configurations for peak power for a few seconds very regularly). The cells stay in balance, even drained down to empty (which I don't do on a regular basis, but have a ocuple of times), using just the pakc-level LVC in the Cycle Analyst to keep me from overdischarging them.I had one cell of the original pack (oldest cells) increase in Ri and start sagging in voltage more than usual, so I swapped it out. I think I used it in the lighting pack above, and I think it is the cell that eventually reversed, but cant' remmeber anymore.So while that's no guarantee of a cell's safety, it's a data point for consideration.Personally, I think that any EV-grade cell like these, that are used in western-built EVs that have a lot of QC and original engineering qualification testing to ensure a cell is really well-designed and manufacturered, is perfectly safe to use as long as it is kept well within it's specifications, even without a traditional BMS. (for instance, just monitoring cell (group) voltages, to ensure no overcharge or overdischarge). Until they get "old", they are likely to be well-matched in characteristics and thus stay balanced on their own, and when they don't any more it is time to replace them anyway.

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