Will my series 3 watch be ok on the charger all day? Does this ruin the battery or the watch? Does it cease charging when it reaches 100%?
Left watch on charger, will it be ok?
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Hi
Yes, it will be OK and no, it will not harm the battery or Apple Watch.
Apple advises that you can charge Apple Watch whenever you want. There is no need to let the battery discharge to any particular level first, nor any benefit to be gained from doing so:
Batteries - Why Lithium-ion? - Apple
Apple's tips for maximising battery life and battery lifespan on Apple Watch are detailed here:
Batteries - Maximizing Performance - Apple
You may find it most convenient to charge your watch nightly, overnight. The watch cannot be overcharged and the battery will not suffer any harm from regular charging. Charging will stop automatically when the battery is fully charged and start again if and when required due to ongoing battery usage.
Be sure to follow Apple's safety and handling instructions and also note that:
- It is not possible to turn the watch off whilst it is on the charger and connected to power - this is normal.
- It is also normal for your watch, power adapter and charging cable to become warm when connected to power.
You may find (the optional) Nightstand Mode useful:
Use Nightstand mode on your Apple Watch - Apple Support
More information:
Check your battery and charge your Apple Watch - Apple Support
Keep Apple Watch within acceptable operating temperatures - Apple Support