Does anyone know the volts and amps needed to charge my
P4P battery? I'm wondering if I can use my 10,000mAh battery bank I have to charge the DJI battery.
The main issue is whether the power bank can sustain its voltage at the required current level all the way through. @
HighTechPauper pointed out "17.5 volts @ 5.7 amps is what the charger is rated" as the guzzoutta capacity of the charger. That is supported by the AC mains going in at up to 100W.
A power bank is being depleted and its own batteries are falling in voltage. If the power bank doesn't have a DC-DC converter to hold up the voltage with the current, then it can't charge the
P4P battery completely.
Next, capacity. 10,000 mAh at what voltage? What you need is WH in excess of each
P4P battery you want to charge as @
alokbhargava points out in a round about way. Also factor in conversion inefficiencies.
10,000 mAh @ 5V = 50 WH. The
P4P batt is 90 WH. So you'd need in excess of 2 of your 10 AH power banks to charge a single
P4P battery (conversion inefficiencies need to be factored in).
Finally of course, how are you going to get your 5V supply up to 17.5 V? Can the power bank output enough current?
17.5V/5 = 3.5 more current so the power bank has to output over 20 A @ 5V into a DC-DC converter that outputs 17.5V (5.7A). (Over 20A because the DC-DC will have conversion inefficiencies).