We don’t know much about the Samsung Galaxy Note 20 yet, but one upgrade that seems likely is a bigger battery, and that’s now specifically been rumored.

According to GalaxyClub (a Dutch Samsung-focused blog) the Galaxy Note 20 will have a battery with a rated capacity of 3,880mAh, which likely means a typical capacity of around 4,000mAh. That’s up from a 3,500mAh battery in the Samsung Galaxy Note 10.

It would also put the battery in line with the 4,000mAh of the Samsung Galaxy S20, which somewhat makes sense since the Samsung Galaxy Note 20 is likely to be at least as big.
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https://www.techradar.com/news/samsung-galaxy-note-20-could-have-a-much-bigger-battery-than-the-galaxy-note-10