I came across these and purchased because, if accurate, they are the best-priced lifepo4 i've ever seen, cheaper than similar capacity of raw cells without a BMS.
I was suspicious of the specs since they're the same size as the well-reviewed 6Ah version, though they are a bit heavier. I don't have a datasheet, but i assume charge and discharge is proportional to the 6Ah version, which recommends .2C charge and discharge, but also lists a max charge current as .5C (instead of the more common 1C charge rate - perhaps that's why they're cheap?)
10.0v and 14.6v cutoffs work as expected. After charging them individually, I wired 6 in parallel ran a discharge test at .2C (1.6A * 6 = 9.6A) It lived up to it's 8AH rating by lasting almost exactly 5 hours, but the total energy came to 576/6=96Wh each, close enough IMHO, and potentially limited by one lower capacity battery in my array.
I have not seen a teardown and haven't taken one apart. They're just the right size to hold 12x18650, but that wouldn't allow such a high capacity. I may individually test and disassemble whichever one has the least capacity.
Update: Tore one open, added photo - it's 16x 18740 (ish) sized cells, 4s4p. They would have to be 2000mAh each which is likely stretching it...
| Manufacturer | Miady |
|---|---|
| Brand | Miady |
| Item Weight | 3.97 pounds |
| Product Dimensions | 5.94 x 3.9 x 3.7 inches |
| Batteries | 1 Lithium ion batteries required. (included) |
| Manufacturer Part Number | LFP16AH |
| Voltage | 12 Volts |
