Got an old Lumia 930 and the battery is shocking. Discharging at 36% per hour.

So I got an old Lumia 930. It's running the latest version of W10 and my battery app says the battery is 100% healthy.

Whenever I use it the battery plummets. Usually by about 30% an hour.

I have turned off:
nfc
4g
Location

No joy. Please help.

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