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iPhone 7 random reboot behavior

i have an iphone7 with a bad IMEI so i just use as a wifi/tethered device to play games on. I replaced the battery about a year ago.
recently it's been acting a bit weird. all of a sudden it will just show the apple logo and reboot. when it shows the passcode screen, i see only 2% battery, but as soon as i plug in a charger it jumps to 80% (or whatever it was at when it rebooted).
IOS battery health says 100% capacity.
3uTools says 100% capacity and 80 charge cycles.

just wondering if anyone's seen this kind of random reboot weirdness? it's worked pretty much perfectly for well over a year, but rebooted at least 4 times in the last 24 hour.
it hasn't been opened since the battery was replaced.

thanks for any advice.

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Mostly its battery issue as you said you have changed it in the past. If the issue still remain after replacing the battery, the next step is to try a charging port. If this wont fix the issue then its logic board issue (Charging IC). I hope this helps

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if it's a bad battery, wouldn't it have manifested itself sooner than 1+ year of usage?

i can definitely try another battery when i get back after the Thanksgiving holiday.

i can also try a different charging port (provided the second hand swap-out is good and free of issues).

the phone hasn't been subjected to any impacts, water exposure, excessive hot or cold temperatures since i acquired it. can the charging IC on the mobo just "go bad" over time?

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@beekerc Charging IC’s become faulty from using cheap cables and from liquid damage they just don’t go bad over time.

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@imicrosoldering good to know

no water damage in this case.

cables could be a factor. i don't use apple cables all the time, but i don't use the cheap, cheap cables.

definitely will tuck this away for reference.

Thank you.

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turns out it was battery swell.

wiped the phone, reloaded from backup - no change.
upgraded to latest IOS and loaded apps from fresh. seemed okay for a couple of days.
as soon as i put the case back on it started up again.
as i was removing the case, i saw some back-light leakage on the side, between the screen and back case, about a 3cm long gap.
the battery was 4.85mm thick at the widest point (a normal, new battery is 3.25mm)

thanks to all for the input and advice

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B C will be eternally grateful.
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