All goods things come to an end, even the rechargeable battery in your PAL® and iPAL® radios.
Rechargeable batteries, by design, have a limited number of charge cycles and will eventually need to be replaced. If you find you are getting less and less cordless time with your PAL or iPAL radio and have had the radio for more than two years (with moderate use); then chances are your battery may need to be replaced. The MA-2 battery pack is a compatible upgrade of the original MA-1 battery pack.
Don't worry, the process is simple, just two little screws, and your PAL radio will be just as good as the day you brought it home.
Battery life and number of charge cycles vary by use and settings.