Re: Philips CP90 and others: memory bettery
I am not familiar with the problem on this set but back up batteries are a real pain in that you don't know they have failed until it is often too late as you describe. These little Lithium packs I have seen used in cheap drones and the capacity and discharge capability are amazing. It might need the R3901 value tweaking a bit but I would measure the charge / discharge currents and see.
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