Oh I've never really had issues, more like how many bowls you got, how many you get before what percentage, how well it works at letting you drain the battery all the way down, does it stop at 40%, for some people the heat protect warning can be triggered though that's never happened to me... Some of my batteries however have difficulty going into cruise when they are below 40% for example, just a variety of little things like that, whereas the P26A have been fully consistent, getting me the most bowls and the most accurate readings reliably...