Eurochron EFTH 902 Mode D'emploi page 40

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If not used for a longer period (e.g. in case of storage), remove the inserted
batteries/rechargeable batteries. There is a danger of old batteries/rechargeable
batteries leaking, which causes damage to the product, loss of warranty/
guarantee!
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Always exchange the entire set of batteries/rechargeable batteries, only use
batteries/rechargeable batteries of the same type and by the same manufacturer
with the same charge status (do not mix full with semi-full or empty batteries/
rechargeable batteries).
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Never mix normal batteries with rechargeable ones. Use either batteries or
rechargeable batteries.
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Regarding environmentally compatible disposal of batteries and rechargeable
batteries, please read the chapter on "disposal".
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