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Here are a reviewa on Lishen 21700 4000mah batteries, link is: https://budgetlightforum.com/node/79382
Specifications:
Battery type: 21700
Battery Capacity: 4000mAh
Battery voltage: 3.6V
Standard charge: CCCV 2A, 4.20V, 200mA cut-off
Rapid charge: CCCV 6A, 4.20V, 100mA cut-off
Max. continuous discharge: 45A with cut-off at 80°C surface temperature
Discharge cut-off voltage: 2.5V
Cycle life: 300 cycles to 60% (25℃)(6A charge / 35A discharge)
MAX Discharge Current: 40A
Data:
Diameter: 21.2mm ± 0.2mm
Length: 70.6mm ± 0.15mm
Weight: 65g ± 2g
Nominal capacity: 4000mAh at 0.2C(800mA) discharge current