06-10-2012 05:59 AM
Check whether the warranty covers the need for a battery change first. Changing the battery is fairly easy provided you're prepared to open up the TPT yourself. FRU numbers from HMM sticky are;
AFAIK, Lenovo also sells them, try this phone number;
Besides the HMM for removal/installation instructions, there are also the Lenovo FRU service videos;
No way in hell I'll be sending in my tablet for something as trivial as that if it's out of warranty.