![]() As for the Eneloop battery, it stayed above 1.1V for 15H. We chose a 1900mAh NiMh battery because it is the closest capacity to 1600mAh that we could find, but higher capacities are easily available.įirst surprise, unlike battery A, this battery B worked for only 7H45 and provided only 1100mAh. ![]() We did the same experiment again with a second battery of the pack freshly charged, that we call battery B, by comparing with an Eneloop (Panasonic) BK-3MCCE of 1900mAh battery, also freshly charged. It is worth noting that by providing about 145mA for 8.5 hours, the USB-C battery only delivered 1230 mAH when it promised 1600 mAH.įor its part, the alkaline battery, which by nature is not regulated, saw its voltage drop steadily for 17 hours before passing the threshold of 1.1V where the USB-C battery turned off. The USB-C battery turns back on several times This behavior could eventually cause problems for digital devices of which the power supply is not managed by a supervisor. On the other hand, the brief restart is probably not deliberate, and if you wait long enough, you realize that these parasitic restarts can occur several times. This voltage drop to 1.1V is probably deliberate: it allows devices that detect the drop in voltage of their power supply to realize that the batteries are almost empty. This voltage drops abruptly after 8 hours to stabilize at ~1.1V for half an hour before the battery dies, and then turns on again very briefly 2 hours later. We can see that the battery provides a stable voltage of 1.45V while supplying about 145mA. We discharged them with two 10Ω resistances while we displayed the values measured by the two Yocto-Watt in Yocto-Visualization. We tested in parallel one of the USB-C batteries, which we call battery A, just out of the charger, with a Duracell PLUS MN1500 alkaline battery. This configuration enables the experiment to live its life quietly in its own corner. The two Yocto-Watt are driven by a YoctoHub-Ethernet powered by a PoE Ethernet cable. To see how these batteries behave, we built a small test bench with two Yocto-Watt batteries, each connected to an AA battery holder and a large power resistance. Therefore, in addition to a charger, the battery also contains a regulator to lower this voltage to 1.5V. They are based on lithium-ion chemistry, which means that the cell inside has a voltage of around 3.2V. These batteries look like ordinary AA batteries except for the USB-C receptacle on the positive pole side. Rechargeable batteries with built-in charger After some research, we realized that it is a generic product made in Asia and sold under a multitude of brand names. We chose batteries sold in Switzerland by a German company but their real country of origin is not mentioned anywhere. We couldn't resist the temptation to buy a pack, just to check if an AA battery with an integrated charger really works. While shopping at one of our usual suppliers, we came across an intriguing gadget: AA batteries, with an integrated USB-C charging port and which promise a capacity of 1600mAh for a 1.5V voltage.
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