Our little work station at the KCMC doctors compound
Left to charge with a larger resistor that could handle 250W
Everything hooked up with voltmeter
Goodmorning-battery charge for a paediatric pulse-oximeter:
9 volts / 250 ohm resistor , charging with approximately 40-50 miliamps, yielding charging rate of about 1/20.
"It needs to be done, and not enough folks are doing it."