bobkart
New Member
I picked up six 40Ah LTO cells earlier this month and am wondering how tolerant of overdischarge they are.
I was individually charging cells to 2.8V and unplugged the charger overnight, but left it connected to the cell (that was my mistake). I assumed the charger would go into high-impedance mode when not powered on, but there is at least a small green LED that stays lit. Well, in the morning I see that the cell had run down to 1.3V, somewhat below the 1.5V they like to stay above (or is it 1.6V)? I quickly added charge again, and the cell seems to be behaving as it did before, although I haven't put it through much since then.
My online searching has turned up no help on this question. I understand LiFePO4's don't like going below 2.5V, and will be damaged by such overdischarge, so this makes me wonder about the LTO cells.
I guess I could put them in a 6S array and apply a moderate load (after first top-balancing them), then monitor individual cell voltages, to see if the cell in question starts dipping before the others. But hopefully someone more knowledgeable about LTO chemistry can weigh in.
I was individually charging cells to 2.8V and unplugged the charger overnight, but left it connected to the cell (that was my mistake). I assumed the charger would go into high-impedance mode when not powered on, but there is at least a small green LED that stays lit. Well, in the morning I see that the cell had run down to 1.3V, somewhat below the 1.5V they like to stay above (or is it 1.6V)? I quickly added charge again, and the cell seems to be behaving as it did before, although I haven't put it through much since then.
My online searching has turned up no help on this question. I understand LiFePO4's don't like going below 2.5V, and will be damaged by such overdischarge, so this makes me wonder about the LTO cells.
I guess I could put them in a 6S array and apply a moderate load (after first top-balancing them), then monitor individual cell voltages, to see if the cell in question starts dipping before the others. But hopefully someone more knowledgeable about LTO chemistry can weigh in.