Advice of Lipo IR.

By the way, I use the packs in series.
I am not concerned with the lipo in fire.
I am worried about MMM esc which high battery IR. will cause hazard.
I think to tell by the performance is subjective.
It is difficult to tell how weak is too weak especially for a basher.
Lipo batteries cost and I intend to get the most out of it.
At least not to throw them away too early.
In other words, when did you throw your packs away?