My Kindle Fire 6” (5th gen) seems to steadily lose battery life even while it’s in sleep mode with all radios off (no wifi, BT, or GPS). Like 1% an hour. I bought it new from Amazon less than half a year ago, and it hasn’t been used very actively so it can’t have gone through that many charge cycles yet.

No third party apps installed except Netflix, so little chance of anything doing background activity during sleep (although please let me know if there’s any way to test this).

Anything I should try or investigate? (Or is it just not a very good battery they use in these low-cost devices?)