3 ms·
FYI, cheap BMS's often don't have low-temperature charge cutout. You may want to test yours if you haven't already. I also wouldn't trust any nameplate amperag
by KennyBlanken 2y ago
FYI, cheap BMS's often don't have low-temperature charge cutout. You may want to test yours if you haven't already.
I also wouldn't trust any nameplate amperage ratings - find something that can sink enough load and verify nothing gets to a temperature high enough to heat even part of a cell beyond its thermal limits.
Another thing to watch for: bus bar corrosion. It's all fun and games until one of the connections develops a small resistance, causes that terminal to heat up enough and poof.
Lastly: the biggest killer of battery packs is physical damage. Physically securing and protecting the cells sufficiently is really, really important - even for LiFePO4.
- stavros 2y agoI fly electric RC planes, and all these failure modes are things that have happened (especially the "physical damage" one), and which are pretty fun, especially when your battery starts smelling sweet and smoking.
- tra3 2y agoGood call. I noticed that my battery wasn't charging fast enough. Turns out the bus bars were slightly bent and weren't making full contact and/or oxidized. Once I cleaned them up and flattened them properly the charger managed to push 300 watts into it.