I'll agree that the mules charging system *****, I use a car battery, or larger mower battery. If it's winter you're screwed anyway. My battery is in a semi heated room ,I'll bet most are mounted on a frozen outside pole. This can be thought out to make sense.
The mighty mule system is very affordable and you can be educated on how to use yours. Do a google search on Mighty mule gate opener motor replacement and watch Mr. Salts video--My old mighty mule- GTO 2000 opener is over 12 years old, i also have a 1000 series and the 500 series-I also have an...