![]() How do they work? I think, maybe they have some integrated DC-to-DC transformer circuitry?Ĭorrect. It's more clever in my opinion (charges with 5V applied via a passive 5V-powered charger.) See and On the other hand, here's a video teardown of a '1.5V' rechargeable Li-ion based battery that doesn't use USB or a hokey proprietary connector at all. ![]() (Maybe it's "The official rechargeable of the Hundred Acre Wood." Yeah, that's it.) Your example appears to be from Poover, an unfortunate company name transliteration if there ever was one. Nonetheless, the most common '1.5V' rechargeable seems to be the micro-USB ones, like you've shown. Kentli's battery uses a recessed 'ring' that connects directly to the battery for charging as opposed to USB, and thus requires a proprietary charger. The Kentli battery and its competitors use a single 3.7V Li-ion cell, with the electronics housed typically in a 'hat' at the (+) end. Such externally-charged '1.5V' Li-ion batteries have been around for a while, since 2014, initially made by the Chinese company Kentli. (Why must the battery be Li-ion? For this specific cell form factor, a comparable NiMH battery is only 600-1000mAh (720 ~ 1200mWh.) So NiMH chemistry could not achieve 3500mWh at 1.5V (~2300mAh) in that form factor: it's just not dense enough. ![]() They’re essentially power banks that output 1.5V with a step-down instead of 5V or 12V with a step-up. The batteries you show use Li-ion cells internally and include a step-down and a USB 5V to Li-ion charge controller.
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