ASCOM d81 Messenger Quick Reference Manual page 15

• For better performance and longer life cycle it is
recommended to charge the battery between +5 ºC (+41
ºF) to +40 ºC (+104 ºF). Charging beyond these conditions
may impair the battery performance and shorten the life
cycle.
• Do not attempt to take a battery apart.
• It is recommeded to power the handset off before
removing the battery.
Battery disposal
Defective batteries must be returned to a collection point for
chemical waste disposal.
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