Some battery-powered grease guns offers two speeds ... I had intermittent problems with “air locking” the grease gun, especially in cool or cold weather. When I started storing the grease ...

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 ...