What should be notice in use batteries?

(1) Before use, check the connected part, clean it by wet rag if necessary and then encase batteries after it become dry.
(2) Don't use old batteries with new batteries in the same time. And different kind batteries is also not allow to use together.
(3) Don't try to charge dry batteries by anyway.
(4) Don't use batteries in short.
(5) Don't knock down and heat up batteries.