Plugging in 'Every so often' can make a pretty big difference, even if it's only a few minutes at a time. Also, if the battery meter on the Forma behaves the same as on the A1, (not saying it does, but a possability to keep in mind,) there can be a few sudden drops by 10% once you get below 70%.
That being said, right off the bat, Forma has a larger battery than Oasis 2, (1200 mAh vs 1000 mAh) and less RAM, so I expect battery life to be noticeably better, (purely based on specs.) That's not even to mention in infamous effects of Kindle indexing can have on battery.
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