P105
Li-Ion 18V 2.6 Ah / 48 Wh
Rechargeable lithium battery
Ryobi 130429105
This is teh currently avaialable battery for ryobi cordless tools. There are several other versions, this one is advertised as "High Capacity 3.0 Ah" which is total bullshit. Battery is clearly labeled 2.6 Ah on case itself, and it contains an arrangement of 2P5S 18650 cells rated at 1300 mAh each in parellel yielding ~2.6 Ah. Cells are specifically rated at a minimum capacity of 1250 mAh with a 0.48 A current, which is less than a 0.5C rating, when power tools will have a much higher draw in practice, likely yielding an actual usable capacity below 1000 mAh per cell. This same arrangement could yield 4-6.6 Ah using commonly available cells. The cheap ass crappy capacity cells used are up-sold as a "light weight" version of teh pack, as they are about 50% full of hot air. Their compact version of this model is most likely 1P5S arrangement of "typical" capacity cells yielding the same net weight in half size and roughly same total power.
The battery pack itself is well constructed with two heatsinked hi power mosfets and thermal sensor. The quality control is reasonably acceptable. Opening case requires removal of 5 security T10 screws, which can be loosened with non-security T10 driver with light pressure. One of Torx screws is covered with a plastic cap blocking screw head, this can be pried out with minimal effort.
TODO:
- Examine charging parameters
- Measure actual capacity across various loads
- Reverse engineer header interface (Toolo?)
Battery pack and bms pcb
Battery Management System PCB
Unpopulated headers at board edge
U1 IC (unidentified microprocessor)
U2 IC (unidentified battery chip)
"Security" Torx T10's and "Anti-Tamper" Cap
Components[edit]
- LGDAHA11865 3.7v 1300 mAh battery (x10)
- IRF1404Z HEXFET PowerMOSFET (x2)
- [U1] F10020 16942Y
- UNKNOWN 20-pin surface mount ic
- [U2] TS1102A ??27KME41 100
- UNKNOWN 30-pin surface mount ic