Are you reading off the balance lead? It seems extremely odd that you are getting 8V+ for a 7.2V battery. Either it's getting overcharged or something is a miss in how you are getting your readings.

FWIW, there are some easy to use devices that you can use to verify you are getting the correct readings from your multi-meter:

https://www.amainhobbies.com/isdt-bg...d-bg8s/p694594