Let me understand this a bit better, you have some 350lb batteries, you know the chemistry, you know the amp/hour, and you come on a flashlight forum to ask what kind of charger you should use. Makes no sense man.
Can you tell us where you got them from, what you plan to do with them, what device they are from?
The more you tell us, the more we can help. So far you have not told us anything.
So far it’s just a story out of a bad novel.
