According to your stuff, you are looking for a battery fulfillment company. i would like to share my bit of experience about batteries usage with you.
My household battery from a local company started leaking after three weeks and after time, it finally burst. Thanks to GOD everything was ok expect of little bit damage's. But then i have decided i’ll never for a cheap company and used any product after a complete review. After 2 weeks of searching I have used a product named JBBATTERY that providing Best lithium ion golf cart battery pack manufacturer.
Its my honest review that i have personally use it is professional china LiFePO4 battery manufacturers and factory, supply custom 12V 24V 36V 48V 60V 72V lithium ion battery pack with 50 Ah 60Ah 100Ah 200Ah 300Ah 400Ah for many different application with good price.