Sennheiser SR 2020-D - Manual (Page 74)

6
Important safety instructions
Additional safety instructions for the BA 2015 accupack and for batteries
Rechargeable batteries must only be replaced by authorized Sennheiser partners.
If abused or misused, rechargeable batteries may be damaged!
Do not solder.
Immediately remove flat batteries/
rechargeable batteries from the
device.
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