Despite this large spread, I found the actual capacities to be essentially identical, and within the margin or error of my tests. The advertised capacities of these batteries differ substantially, ranging from 2775 mWh (TenaVolts) to 3300 mWh (EBL-3300). The Y-axis contains the temperature of the discharge (in degrees Fahrenheit), and, for each of three temperatures, 5 discharge rates, in mA. Graph showing capacities, on left axis, measured in mWh, for AA Li-Ion rechargeable batteries from three vendors. For a discussion of battery capacity metrics, see my post Deep Tech: Trail Camera Batteries. Capacities are all in mWh - a unit of energy, not to be confused with mAh. I measured the full matrix of 5 load conditions (100 mA, 200 mA, 300 mA, 400 mA, and 500 mA) and and 3 temperatures (68F, 40F, 0F). Load and Temperatureīelow is graph summarizing capacities I measured of fully charged cells. If you connect one of these the batteries to the micro-USB charger and no LEDs come on, something is wrong with the charger or the battery. One color LED comes on when the batteries are actively charging, and another color LED when charging is complete. The Pownergy and EBL batteries use a two-color LED system. You can avoid this ambiguity by making sure that the blue charging band comes on for all batteries when they are initially placed in the charger. This confuses the “not charged” with the “fully charged” state. The problem with this scheme is that failure of the battery to charge also causes the blue LED to go off. When charging is complete, the LED goes off. In the TenaVolts system, a blue LED lights up a ring around the base of the battery when it is charging. In my opinion, the Pownergy and EBL batteries have a better charge indication system than TenaVolts cells. It will be important to keep debris out of the micro-USB sockets on these batteries. However, I found that the pigtail charging cable worked surprisingly well in practice. I thought the micro-USB connectors might be awkward to use or fragile. Pownergy AA Li-Ion batteries shown here with USB-based charging “pigtail” These batteries come with a USB-A to micro-USB pigtail which allows simultaneous charging of 4 batteries from a standard USB port. The Pownergy and EBL batteries have micro-USB sockets built into the top of each battery, near the positive terminal. The 4-battery charger has a micro-USB socket. The TenaVolts batteries use a special charging block - as small as two batteries, and as large as 20. Putting them in a AA recharger for NiMH AA cells will not work. Charging Li-Ion AA BatteriesĮach of these batteries requires a special charger designed to adapt to their power converter. This battery appears to be similar to Energizer Ultimate Lithium batteries. The EBL Amazon site also lists a much lower cost, higher capacity, primary (non-rechargeable) “3000 mAh” (4500 mWh) AA “Li Metal” battery. Note that EBL also has a lower capacity rechargeable Li-Ion AA batteries: 3000 mWh with similar charging mechanism to TenaVolts. Summary of Li-Ion Battery types surveyed in this post The table below gives the vendor-rated capacity and charging method for these batteries. In this post, I add two more to my list, the EBL-3300 and a battery from Pownergy. In an earliet post, I covered Li-Ion AA cells from TenaVolts. I am grateful to FaceBook-friend Derell Licht for suggesting this investigation, and for letting me borrow his new batteries for testing. temperature and discharge rates, I also discuss charging differences and limitations of these cells. In this post, I look specifically at rechargeable AA Li-Ion batteries from TenaVolts, EBL, and Pownergy. See: Trail Camera Batteries: Internal AA-Cell Options and Deep Tech: Trail Camera Batteries. In earlier posts I looked at general AA internal battery options for Trail Cameras. In this post I look at the capacities of three brands of Li-Ion rechargeable AA batteries under trail camera conditions. Li-Ion rechargeable batteries from three vendors tested in this post in the battery tester
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