So I got an older Toro lithium battery with a busted hedge trimmer. The motor on the trimmer burned up at some point so could well have drawn some big amperage, don't know.
I'm trying to test the battery to see if it's good. It's a 24V battery. It seems to charge fine, shows 24.5V no load.
However, and this where I'm wondering, I was trying to test it to see its capacity. Since I don't have any Toro tool, I put a 100 ohm resistor on it with a power meter. It draws 6W and 1/4A. So it should really not tax a biggish battery like this one. Yet, after just a few minutes running at 6W (with the voltage staying above 24.2V) it shuts down completely and abruptly (as in less than a second). Shows 0V (as in a couple of millivolts). It's like the BMS (or something) shut it down deliberately.
Seems pretty odd. First time I've seen that. Any chance that the BMS does not like a small draw for some reason, or maybe a thermal protection gizmo is going crazy despite the low draw? That seems farfetched to me, but eh, I may be wrong on that.
Thoughts before I take that thing apart and starts digging in?
I'm trying to test the battery to see if it's good. It's a 24V battery. It seems to charge fine, shows 24.5V no load.
However, and this where I'm wondering, I was trying to test it to see its capacity. Since I don't have any Toro tool, I put a 100 ohm resistor on it with a power meter. It draws 6W and 1/4A. So it should really not tax a biggish battery like this one. Yet, after just a few minutes running at 6W (with the voltage staying above 24.2V) it shuts down completely and abruptly (as in less than a second). Shows 0V (as in a couple of millivolts). It's like the BMS (or something) shut it down deliberately.
Seems pretty odd. First time I've seen that. Any chance that the BMS does not like a small draw for some reason, or maybe a thermal protection gizmo is going crazy despite the low draw? That seems farfetched to me, but eh, I may be wrong on that.
Thoughts before I take that thing apart and starts digging in?