I have an ES700 which is approximately 2 years old (warranty replacement, so may have been refurbished) and whose battery is, or at least was, in good condition.
Yesterday morning we had a power cut and the UPS kicked in as expected, giving time for me to shut down PC and NAS and half-charge my phone in case it was a long outage. Eventually the low battery warning (constant rapid beeps) started and I possibly made the mistake of turning it off to keep it quiet. When the power came back on the surge protection sockets work as normal, but the power button does nothing and the backup sockets have no passthrough power. It's now been connected to utility power while turned off for over 24 hours so should have recharged fully.
Any suggestions for what to try next gratefully received!
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