The "A" in the battery nomenclature indicates the fact that the battery without the "A" has been reengineered
and or updated so return, if possible, the outmoded battery indicating to the reluctant vendor, if so, that
refusal to do so can result in product liability, as some batteries can actually explode or cause fire, or at
least product malfunction as you are already experiencing.
Then go on to Sony's website and see if there are warnings for your particular battery, or if there is also
a warning that such batteries are in circulation that are knockoffs, counterfeits, that are egregiously guilty
of all of the above.
Now, in order to get the most out of your experience on the Sony website, please specify the EXACT model
on
This Page as I have only the following: VAIO® VGN-FJ290P1 whereas the following are your alternatives:
VGN-FJ290P1B
VGN-FJ290P1G
VGN-FJ290P1L
VGN-FJ290P1R
VGN-FJ290P1V
VGN-FJ290P1W