I have not had any issues changing to my second battery on the trail. It is my understanding the firmware on the bike needs to be updated with both the original and new battery before you use the new battery. Buy a second battery and don't look back. It is $150 more than a range extender, available immediately, and more than twice the capacity of 2 range extenders. It is a no brainer.....not sure why people are still going with the range extender.Dumb question but are there any software issues with the battery swap that riders report with the extender?