screwdriver mod.

[ben7]

Re: screwdriver mod.

Question 2: I am sure that the inductive kickback of my cordless drill will kill the protection circuit.. Any simple solution for that?

Q2: I usually use an MOV. The trick is to make the clamp voltage high enough that the MOV is only active when the voltage is high enough to fry the circuit. Too low, and the MOV clamps all the time, you use the life up. When that happens, failure mode is flames. that's why I always epoxy a thermal fuse on the back. Thermal fuse probably not required though.

You could also use a "TVS" diode. It's like an MOV.

[kc8adu]

Re: screwdriver mod.

have to look into that too.had good luck so far with the tp4056 boards but its still good to have a backup.spike kills mosfet on protection board and that is quietly gone with no other symptoms.the fpe breaker of the li-ion world.