>> The battery in a mobile phone has a limited service life, sat nav or no
>> sat nav.
Yup, a rechargeable battery never quite goes back to 100%; it will only last so many cycles.
Notionally those cycles are 'fully charged' to nearly flat. Laptop batteries, at least anecdotally, last better if you charge them then work on battery 'til low>recharge and so on. Running on mains all time jiggers the battery.
Does same apply to phones kept tied to car's chargepoint or (as I do) a 15,000ma chargepack in door pocket?
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