Not A Good Unit

I purchased the GB40 Noco battery booster a few years ago. I placed booster in glove box for an emergency, and had no occasion to use it till this year. I did remove it a few times to recharge unit again for emergencies. The lights on the unit seemed to chase and lock in but never delivered a boost. I follower all directions to override auto feature but still no boost delivered. When I contacted company they said they would offer 10 percent discount if I purchase one from there website. No thank you, I see many people on line trying to repair them themselves but this is a bad safety practice in my opinion. I would not recommend Noco products.site won’t let put 0 star which it deserves.