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 ...

The latest generation of battery-powered grease guns can produce up to 10,000 psi. Rohan says 7,500 psi is generally adequate for farm use. “Ten thousand psi sounds good, but can push grease ...