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Hello Jen, thanks for taking the time to ask us your question about the Samsung Galaxy Watch8. The Galaxy Watch8 40mm model comes with a 325mAh battery, and the 44mm model has a 435mAh battery. Both options offer up to 30 hours of use in Always On Display (AOD) mode. If you have any other questions for us or if you would like further assistance, please let us know by contacting Support. Thanks for being a cherished Samsung customer. - Debra
Sorry, there was a problem. Please try again later.If you're not active, it'll last about 48 hours. Otherwise I'll get a good 24 hours out it and I sleep with it on. By the time I wake up I'll have like 20% left. The last watch I had was the 5 and there is no difference in battery life. It's not any better.
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