The Sage, like the Oasis, was supposed to have a power cover. It allegedly doesn't work well and there are maybe 6 or 8 strong rectangular magnets inside the Sage, maybe to hold the cover. Four pads that are not USB for the cover (+, - and either sensing or signalling).
The case opens easily enough to replace the battery, but the small PCB with pads is on the back connected with a ribbon to the main PCB, mounted on the display chassis on the front panel.·
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