Question: what is the difference between porter cable red batteries and black batteries?
Answer: Both batteries are 20V lithium and they are interchangeable. The difference is the black battery (PCC681L) is rated 1.3Ah and the red battery (PCC680L) is rated 1.5Ah. Batteries with a higher Ah (amp hour) rating have a little more power and runtime, that's why they usually cost more.