The spray gun in question is also what might ... For the vast majority of spray painting tasks, a portable battery-powered HVLP (high volume low pressure) paint sprayer is an affordable alternative.

But have you used Ryobi's battery-operated grease gun? The ONE+ 18V Cordless Grease Gun itself is available through direct order from Ryobi, at a price of $159. But if you need the 2.0 Ah battery ...