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Identifying a lithium battery

Rubia30

I'm trying to identify these batteries within an alarm unit that I need to replace since they are no longer holding a charge. 

I've had a look online and cannot find anything with the same numbers as shown on the side. 

Does anyone know if these are a standard type of flat battery i.e. in the same as AA, D have designations that I just don't know the name for regardless of the serial numbers etc. on the side? They measure roughly 38mm*38mm*5mm.

Thanks

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  • 0 in reply to Gel Jones

    I don't think that product has the same voltage. Need to be careful with overcharge ... also do we need to worry that the chemistry of the two batteries might not be the same, so the charger profile may not be the same?

    Just being caution, as lithium batteries are not nice when things go wrong.

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