Most equipment would tolerate this, but some would not. Unfortunately nickel-cadmium and nickel metal hydride Cells have a nominal voltage of 1.2V which is somewhat lower than the 1.5V of traditional zinc carbon and alkaline cells. No different than any given usb power bank, except the specifics of the voltage being used.ĭifferent battery chemistries have different nominal voltages and different discharge profiles.
#1.2 VOLT AAA RECHARGEABLE BATTERIES FULL#
The circuitry handles battery protection and low voltage lockout so you get pretty much a full life at 1.5V instead of the slowly dropping voltage of a primary or non-regulated bare secondary cells. If you combine these two circuits, you get the one you are asking about, a usb chargeable li-ion with a 1.5V output voltage switching regulator. While an older version required a 3rd non-standard contact as a ring around the positive contact for charging the Li-ion cell separately, but has a built in switching regulator for 1.5V output.
#1.2 VOLT AAA RECHARGEABLE BATTERIES PLUS#
It has a pair of charging ICs plus protection ICs, but has not output regulation. While not the one you are asking about, here are two similar ones. Yesterday's 4 inch pcb is today's dime size single chip IC. These are just the latest, thanks to Miniaturization of electronics. There's been multiple types over the last decade that tries to work like a ubiquitous battery. 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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