A: This one has a longer run time and doesn't start to lose power as quickly. It's good to own both as I do (several ). Small version for light jobs or tight places and the big guy for the tougher jobs. Love the quality of the tools AND batteries. I own the driver/ drill driver and impact driver. * Caution: Never try and recharge a battery until you're sure it has cooled down.
A: The difference is you do get a bit more power but you also get an extended run time. Plus the bigger battery does balance the drill a little nicer in your hand. I have 3 and it's nice to have the longer run time . It did save me some time when I was screwing down 3/4" treated lumber for my 8x16 shed floor and knocking in 3 1/2" treated screws from my rim joists into my 2x6 floor framing joists. Would highly reco. you buy the two pack at H/D around the holidays where you often see two for one promotions.
A: Advertisement for the larger M12 series batteries does state that it is compatible with all M12 series tools. I'd give them a call to verify this.
A: no it will not work with Ryobi Sa120.
A: No, it will not. This REDLITHIUM extended-capacity battery is compatible with all Milwaukee M12 cordless power tools except and electronics except the 2320 M12 plumb laser and 2290 sub-scanner M12 cordless detection tool.