Sennheiser Presence - Rechargeable Battery Safety

Important safety information
Presence | 3
Safety instructions for rechargeable batteries
In extreme cases, abuse or misuse of rechargeable batteries can lead to:
WARNING
•explosion,
• fire development,
• heat generation or
• smoke or gas development.
Dispose of products with
built-in rechargeable
batteries at special
collection points or return
them to your specialist
dealer.
Switch rechargeable
battery-powered products
off after use.
Only charge rechargeable
batteries at ambient
temperatures between
10°C/50°F and 40°C/104°F.
When not using
rechargeable batteries for
extended periods of time,
charge them regularly
(about every 3 months).
Do not heat above 70 °C/
158 °F, e.g. do not expose
to sunlight or throw into
a fire.