[QUOTE=Lifer;12298587]One last opinion based on hard-earned experience: Never be loyal to a battery pack. If it is old, questionable, etc., toss it out. Batteries are the least expensive component in your airplane. Replace whenever there is any doubt.
How old is too old for A123 batteries ?? So far I have some that are approaching 8 years old that still perform just as well as they did when I bought them.