How to test battery is bad

My battery was bad today and it's wonton three year warranty. Voltage is 6.7v。 Sams club claim they have to test it in their charger because Rotary may damage the battery。 it takes 5 min to one hour. is it true。

所有跟帖： 

• Anyone can help? -讓股票飛- ♀ (0 bytes) () 08/17/2015 postreply 10:56:02

• 有可能，你也可以去AutoZone 測試一下 -soccer88- ♂ (0 bytes) () 08/17/2015 postreply 10:58:02

• Yes, when voltage drop <11.7V, the caocity is 0 -方宜- ♂ (307 bytes) () 08/17/2015 postreply 11:47:00