Sena Bluetooth SMH5 v1.3 User's Guide - Manual (Page 27)

SMH5
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BATTERY INFORMATION
The Product 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 15ºC and 25ºC (59ºF and
77ºF). 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.
MAINTENANCE AND CARE
The Product should be treated with care and the following suggestions
will help you protect your warranty coverage.
1 Do not use or store the device in dusty, dirty areas. Its moving
parts and electronic components can be damaged.
2. Do not store the device in hot areas. High temperatures can
shorten the life of electronic devices, damage batteries, and wrap
or melt certain plastics.
3. Do not store the device in cold areas. When the device returns to
its normal temperature, moisture can form inside the device and
damage electronic circuit boards.
4. Do not attempt to open the product.
5. Do not drop or knock the device. Rough handling can break
internal circuit boards and fine mechanics.
6. Do not use harsh chemicals, cleaning solvents, or strong
detergents to clean the device.
7. Do not paint the device. Paint can clog the moving parts and
prevent proper operation.
These suggestions apply equally to the headset main unit, clamp
unit, or power charger.