DIY Powerbank with 18650 cells - anyone tried these ?

Equipment Radios & Power
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Thinkpow Powerbank - Ramp Current Test (Samsung Cells)

Thinkpow%20Ramp%20Current%20Test%20(Samsung%20Cells)
Thinkpow Ramp Current Test (Samsung Cells).jpg697×614 106 KB

Okay up to 1.4 Amps - not enough to power an FT-817.