Sanyo M1 - Manual (Page 36)

20 Section 2A: Phone Basics
Installing the Battery
To install the Li-Ion battery:
ᮣ To install, insert the battery into the opening on the back of the phone
and gently press down until the latch snaps into place.
Removing the Battery
To remove your battery:
1. Make sure the power is off so that you don’t lose any stored numbers
or messages.
2. Push up on the battery release latch and lift the battery up and away
from the phone.
WARNING Do not handle a damaged or leaking Li-Ion battery as you can be
burned.