You claim they match up to a sony. Here are the specs on the Voidhawk from their site and below are the sony specs. They aren't even in the same ball park when it comes to being close close.
VoidHawk™ 3.7v 3400mAh Protected 18650 Lithium-Ion Battery Technical Datasheet:
Nominal Capacity:3400mAh (0.2C, 2.75V discharge)
Recharge Cycles:800 (85% storage capacity at 500 cycles)
Charging Voltage:4.2 ±0.05 V
Nominal Voltage:3.7V
Charging Method:CC-CV (constant voltage with limited current)
Charging Current:1625mA
Charging Time4 hours
Max. Charge Current:1625mA(ambient temperature 25°C)
Max. Discharge Current:5200mA(ambient temperature 25°C)
Discharge Cut-off Voltage:2.75V
Cell Weight:47.5g
Volumetric Energy Density:676 Wh/l
Gravimetric Energy Density:243 Wh/kg
Cell Dimension:Height: 65.00mm Diameter: 18.40mm
Operating Temperature:Charge: 0 to 45°C Discharge: -20 to 60°C
PCB Overcharge detection voltage(VCU):4.325±0.05V
PCB Overcharge detection delay time:1.2±0.5 S
PCB Overcharge release voltage:4.05±0.05V
PCB Under-discharge detection voltage(VDD):2.50±0.10V
PCB Under-discharge detection delay time:144mS
PCB Under-discharge release voltage:3.0±0.1V
PCB Excess current threshold (IEC):7 A
PCB Maximum Pulse Current:5.2 A
PCB Maximum Continuous Current:3.5A
Short Circuit Detection delay time:Max .320uS
Here are the Sony VTC5 specs.
- Nominal Capacity: 2600mAh
- Rated Capacity: 2500mAh
- Max Discharge Current: 30A
- Nominal Voltage: 3.6V
- Full charge Voltage: 4.2V
- Operating Temperature (cell surface): Charge 0 ~ 50℃ , Discharge -20 ~ 75℃
- Diameter 18.45mm max +/- 0.05mm
- Length 65.20mm max +/- 0.05mm
- Weight : 44 g Average
- Positive terminal: Flat top
- Battery Type / shape: 18650 Cylindrical
- Manufacturer: Sony Energy