Amazon.com: Technical Precision Replacement for RYOBI HP1802M Battery : Electronics
Power tool battery RYOBI RY-1804, 18V, 3.3Ah, Ni-MH | eBay
I know squat about this stuff. Going from an old HP1802M to a P209; is this an upgrade, downgrade, or a lateral move? Being used for light duty drilling, screwing, nut driving,