Re: Philips CP90 and others: memory battery.
@Ben: Lithium cells cannot be charged safely from a current source that is fed with a higher voltage. They will charge up beyond 4,2V and fail. They can theoretically be used to replace series strings of 3 NiCd cells when a 3,9V zener diode is wired in parallel. They will never be fully charged but they won't fail. Maybe even last longer lacking a full charge.
@redtoblack: that would have been primary (non rechargeable) lithium cells.
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