My new battery isn't charging. Is it defective?
Usually NO. New batteries come in a discharged condition and must be fully charged before use.
It is recommended that you fully charge and discharge the new battery two to four times to allow
it to reach its maximum rated capacity   >> More info
How can I maximize the performance of my battery?
Prevent the Memory Effect - Keep the battery healthy by fully charging and then fully discharging
it at least once every two to three weeks. Exceptions to the rule are Li-Ion batteries which do not
suffer from the memory effect   >> More info
Is it Possible to Upgrade the Device's Battery to a newer Chemistry?
Maybe. Ni-Cd, Ni-MH and Li-ion are all fundamentally different from one another and  >> More info