As above; I just purchased an inflator that should be good for four tires (but not tested yet). A couple of times I've either been on pretty long rides (40 miles off road with 8,000' of climbing) or it was blazing hot with mosquitoes swarming and an inflator would trump a mini pump (which will be the back up). As far as forgetting to charge the battery, if I worried about that I might worry about forgetting to wear pants.