Sorry for your crash, did you put your phone into "flight mode" before flying? It's recommended to avoid interferences.
Also read the manual and perform compass calibrations before flight.
See this video :
Regarding charger or analyzer, I suggest you the reading of this article:
oscarliang.com
Also read the manual and perform compass calibrations before flight.
See this video :
Regarding charger or analyzer, I suggest you the reading of this article:

When to Retire/Dispose LiPo Battery? - Oscar Liang
IR or internal resistance is the indicator of LiPo battery health and performance, if IR is high you should retire that LiPo and throw it out.