The first one had a 250mAh.
1000mAh isn't too bad, but it feels like the Oasis is consuming a lot more battery than the Paperwhite, which has only 50% more battery.
For reference, my Kindle Paperwhite lasts between 2x to 5x longer on a 1450mAh battery, than the Oasis on a 1000mAh battery.
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