Review on ENERBRIDGE Electric Air Pump for Inflatables - Air Mattress Pump for Swimming Ring, Paddling Pool, Snow Tube, Blow up Pool Raft Boat - Inflate Deflate with 3 Nozzles - 110V AC/12V DC (50W) by Michele Pearson

So I think there are special electric air pumps to inflate balls for stability. This isn't one of them. It literally took less than 2 minutes. Not only did he not inflate my ball, but the motor immediately started rumbling very loudly and then just stopped. It's probably perfect for things like pool rafts or toys, but I can't imagine it would be good for a large air mattress or other large inflatable item. I did some digging and found the exact model under various brand names and came across one that said NOT FOR STABILITY BALLS. I gave it 4 stars because I think it's suitable for small inflatables, but manufacturers for this type of model should be clearer about what it can or can't inflate. It was very cheap so can't complain too much. I found one that actually claims it's for stability balls and it's only a few bucks more. This is what I found for stability balls. ONG NAMO Electric Air Pump Fast Air Pump with 4 Nozzles Air Mattress Bed Boat Swim Ring Inflatable Pool Toy AC 110V(300W)