RE: futaba 12Z battery question
The Fromeco Relio cells may be a higher quality but then most are made in China anyway so who knows. I once bought a genuine Sony at WalMart but it would drop to 50% after two flights. Sent it off to Sony who replaced it with one that worked perfectly. Usually Sony is top of the line so quality can have duds too.
Bought generic versions after that, never had a similar issue. I toss them after two years anyway and that is about how long the original Futaba versions lasted. Most folks are unaware that LiPo and LiIon batteries only have an expected service life of 2-3 years. So shop wisely.
At the low prices for generics I don't care if I get a few low life/performers in a batch. Use them for shop/setup packs and save the higher performers for flying days.