You can test the resistance on attys; Red to center and black to threads and it should read 2.2 - 2.8 ohms
Batts should charge and then show 3.7v on a tornado or up to 4.2v on a SD.
Basically they work or they dont. Are you talking about multi pack equipment? Normal TW products have a 28 day warranty on them - the Multi Pack attys and batts do not, but they cost less and are guaranteed to be the exact same quality. I but all my attys in MPs and have never had an issue
