Sena Bluetooth SR10 v1.2 User's Guide - Manual (Page 20)

English
21
BATTERY INFORMATION
The SR10 has an internal, non-removable, rechargeable battery.
Do not attempt to remove the battery from the device as you may
damage the device. The battery can be charged and discharged
hundreds of times, but it will eventually wear out. Recharge the
battery only with Sena approved chargers designated for this
device. Use of an unapproved charger may present a risk of fire,
explosion, leakage, or other hazard.
Always try to keep the battery between 15°C and 25°C (59°F
and 77°F). Extreme temperatures reduce the capacity and
lifetime of the battery. A device with a hot or cold battery may
not work temporarily. Battery performance is particularly limited
in temperatures well below freezing.
Do not dispose of batteries in a fire as they may explode.
Batteries may also explode if damaged. Never use any charger
that is damaged. Operating times are estimates only and depend
on the devices used together, features used, battery age and
condition, temperatures to which battery is exposed, and many
other factors.