5 Volt for charging?

Hi All,
We just had to run our third Li battery pack off to
recycling due to the battery swelling.  THis last one
actually cracked the case.
So I am thing that I will build her a NiMH pack
that I can remove the batteries and charge them
on NiMH friendly charger.
Two questions:
1) Am I right that the charging circuitry is
in the tablet not he battery pack?
2) Am I correct that I I need to do is provide
a regulated 5 volt souse?
Many thanks,
-T