I bought a new higher capacty battery but the voltage on the battery is 15.2V and on the existing battery is 11.4V. Is this the right battery? As you can see the old battery became puffy. No idea how that happened.
https://www.replacement-batteries.co.uk/getac-laptop-battery/3687.html
https://www.replacement-batteries.co.uk/getac-laptop-battery/3687.html