Trailer/Toad Battery to Power Breakaway
Any trailer or toad electric braking system needs a source of power to activate the brakes in case of a breakaway. Obviously, this battery needs to be charged before starting to tow. It is my impression that trailers use the “house batteries” to power the breakaway function, so trailer owners will likely take care of the charge before a trip.
My Blue Ox Patriot auxiliary braking system for our toad has an internal battery for this service, which is continuously charged while it is in use. However, the Patriot has no way to determine the state of charge. The manual makes no mention of how to check the charge, nor even that it needs to be charged before towing. Last year I opened it up and tested the battery. I decided that since it was nearly ten years old to replace it.
I have always just set up the Patriot system in our toad and driven away once it was ready. If the battery had a low state of charge, it may not have had enough power to activate the breakaway if it had been needed early in the trip, before it was charged through the power supply cable. My new practice is to plug it into a power source the day before a trip to be sure it is charged.
2011 Sunseeker 3100
2016 Ford Edge Toad