TecmateOptimate DC to DC, TM-500v3, 6-Step 12V/12.8V 2A Sealed Battery Saving Charger & Maintainer

I tow a 2022 Chevy Equinox behind my Class A motorhome. The new cars are all computer driven. The ingination has to been in accesory mode to maintain the steering since it a electronic controlled. You can not safely just run a hot lead from your towing vehicle to the towed vehicle battery without creating a problem. This 12VDC to 12VDC mainainer/caharger will work. I tested it out before hitting the road.I am very happy with it and it works perfectly. I attached it to the engine batteries first and then the vechile.turned the key to acc. and turn on the radoo and interior lites, left hooked up for 8 hours. Battery in car was fully charged when disconnected.I had to buy a add cord to make the length right.Worth the bucks

Just drained my 20ah battery...twice. I fail to understand how this is classified as a 'charger'.

I bought three of these to keep my three motorcycle batteries charged all winter when they are in storage. I’ve only had them for three years, and one has already failed and another one is acting strangely. These are way too expensive to only get a few seasons out of them.