Question:  I want to test the Thunder Sky LP batteries. I asked a friend of mine, and he borrowed for me several different batteries. However I am not happy with the performance of the batteries.

Answer: We do not recommend to “borrow several different batteries” to make the tests. We always recommend using new batteries or batteries with assured specifications. If you use “some borrowed batteries”, you are never sure what was the history of the batteries and what is the real performance of the batteries. Especially as the possible damage to the batteries is invisible from the outside.