Is it ok to charge my watch with 40% battery left?
I wear my watch all day and half the night. When I go to bed it still has 40% battery left.
Is it ok to charge it then or wait until it gets below 5%?
Apple Watch, iOS 2.x
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To expand: Apple Watch uses a lithium-ion battery. There is no need to let Apple lithium-ion batteries discharge to any particular level before recharging them. They work on complete charging cycles, which are counted on a cumulative basis.
For example: if you fully recharge your battery after it has discharged to 50% on each of two consecutive days, it will have used one complete charging cycle in total.
The Apple Watch battery is designed to retain up to 80% its original capacity after 1,000 complete charge cycles.