I am looking to power my Arduino Pro Mini 3.3V. I tried using a CR 2032 with a 5V step-up regulator from Pololu to the RAW pin and it worked for a short while before dying. I am very limited on space. Does anyone have any suggestions to fix this problem? I've considered a 3.7V 110mAh LiPo but the application would prefer if it wasn't rechargeable.