One of the best entry-level portable batteries I've tested is $100 off for October Prime Day
Briefly

The EcoFlow River 3 is designed for portability, featuring an impressive fast charging capability that gets it from 0% to 100% in 55 minutes and has a capacity of 245Wh, making it ideal for small devices.
While the River series offers convenience and portability, they sacrifice power compared to bulkier alternatives like the Delta series, which are intended for more demanding energy needs.
Weighing under 8 lbs, the River 3 can be easily transported, making it suitable for users who need lightweight solutions for charging small devices away from traditional power sources.
Unlike the bulkier Delta series, the River 3's compact design allows it to be carried anywhere, proving to be a practical choice for short-term power needs.
Read at ZDNET
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