Apple Watch series 3 will not hold the charge
Is there a replacement battery for Apple Watch series 3?
Apple Watch
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I'/m sure there is a replacement battery for the series 3 watch. For repair & service:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support
To understand Apple Watch performance and its relation to your battery, see:
Apple Watch Battery and Performance - Apple Support
“Battery life” is the amount of time your device runs before it needs to be recharged. “Battery lifespan” is the amount of time your battery lasts until it needs to be replaced. Maximize both and you’ll get the most out of your Apple devices, no matter which ones you own. See the "Tips for Apple Watch" section in:
Batteries - Maximizing Performance - Apple