Metz Mecablitz 44 AF-3M - Manual (Page 67)

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Disposal of batteries
Do not dispose of spent batteries with domestic rubbish.
Please return spent batteries to collecting points should they exist in your
country!
Please return only fully discharged batteries.
Normally, batteries are fully discharged if:
- The device they powered switches itself off and indicates "Spent Batteries".
- They no longer function properly after prolonged use.
To ensure short-circuit safety please cover the battery poles with adhesive
tape.