In a laptop with no larger battery, during startup, I see messages that CMOS has the wrong settings and the time always resets to 0. I opened the computer and found a small battery, however, it is wrapped inside a black plastic and the plastic has no label. From this battery, is attached one red and one black wire, approximately 7" in length, which has a tiny white plug. The appearance is quite similar to [this](
http://www.ebay.com/itm/Medion-MIM20...item35e692d445), although different. There is no model number on the outside.
No service manual is available for the laptop.
Is destroying the battery, by cutting the plastic away the only solution to determining what kind of battery replacement is needed? Or are all such batteries the same inside and any will do for any computer, provided the plug fits?