Oh Man, MrKang, thank you, but MOST ALL ebike newbies have no idea of what happens when/if defective lipo goes up in self-fueled flame hotter than an oxygen-acetylene torch.
Just a short, just a bad charger, just a tiny error in assmebling, and Mr. Newbie has just lost his home or his life or both.
LiPo for those who KWYADAWYADI, and manganese or ferrite lithium for we others.
Cheeful advocation of liPo, without warnings, is a cheerful invitation for blithe, incompetents, to die =because you did not tell them bettter= how vital it is that the battery, not a single cell, ever short.
500 million at least, of miniature lipos are in "safe" service: with big corporate names behind them. There are tons of no-name chargers and defective, bare cells. Build cheap. Good luck, probably nothing will happen to the home brewer of budget, obsolete but so-light and wonderful old LiPo explosion tarts.
My leanings; I am not a battery eggspert.