Found that soshine actually has their own web site and cites their 6F22 battery -
http://www.soshine.com.cn/a57.aspxLooks like it's now (vs. the LiFePO4 mentioned previously) two LiPo cells.
Still looking for 3S1P LiFePO4 in 6F22.
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New 9V Li-po Rechargeable Battery: 650mAh 7.4V
Bar Code: 6951151510211
Model: Li-7.4V-650S
Can charged by other 9V charger
Slim design(15.4mm)
Ready to use at any time
Specification:
Type: Rechargeable Li-Po
Dimension:(48.5+-0.5)*(26.1+-0.2)*(15.4+-0.3)mm (max)
C5mAh: 630(mini)
C5mA: 650mAh
Nominal Voltage: 7.4V
Capacity : Nominal 650mAh
Minimum 630mAh
Internal resistance: 144-150 mΩ
when discharged at 0.2C5mA to 5.5V
Recommended Charging Conditions:0.2C5mA charge termination control parameters taper current 0.01C5mA at 8.4V
Service Life: 1,000 cycles(>=60% C5mAh,0.2C discharge)
Weight: 28 g (1 cell), 67 (2 cells with package)
Charging Voltage: 8.4+/-0.15V
Ambient Temperature Range
Charging : 0-45 centigrade
Discharging: -20 to +60 centigrade
Storage : -20 to +40 centigrade
Note:
(1) The batteries should be stored at room temperature,charged to about 30% to 50% of capacity.
(2) During long term storage,in order to ensure the battery to maintain the capacity level,we suggest Li-ion batteries should be charged and discharged once every 6 months.