I want to use a Black & Decker 20V Max battery to power a small grinder I have, but I can't determine the maximum current the battery will produce reliably. The grinder DC motor is rated at 4 amps at 18 volts. Can I safely pull 4 amps from the 20v Max battery?
I haven't opened up the battery paack yet, but I'm sure it has 5 x 18650 cells inside. Those are rated for 3.6 Ah, but the battery pack is only 1.5 Ah. Why would the battery pack be rated so much lower than the individual cells? 18650 will do almost 4 amps, so 5 in series should be enough for occasional use of my grinder.
TIA
hans