Bests & Worsts Reviews from Amazon

My car battery was discharged to the point that my Battery Tender Plus 1.25A charger/maintainer would not even attempt to charge it. I purchased a Noco Genius5 charger/maintainer that has successfully charged my battery without requiring that I activate Noco's 'force mode' that will charge a battery that has become discharged to 0 volts. Below are three points to keep in mind if you decide to buy a Noco charger/maintainer. 1. Select the correct Noco for your battery. Each Noco is rated for a certain number of Amp-hours (Ah). The Genius2 is rated for 40Ah, the Genius5 is rated for 120Ah, and the Genius10 is rated for 230Ah. My car battery's capacity is 92Ah, so the Genius2 would not be able to fully charge it; however, the Genius5 is able to fully charge it. 2. Be patient because the Noco may require longer to charge your battery than the owner's manual suggests, for two reasons. First, the '25% charge' step includes a de-sulfation process that can take some time - for my discharged battery, more than 24 hours were required for this step. Second, the '100% charge' step includes an optimization process that can also take some time. So, whereas the Noco spent only a few hours in each of the '50% charge' and '75% charge' steps, the '25% charge' and '100% charge' steps required more time. 3. As the Owner's Manual indicates, you MUST disconnect your battery from your vehicle prior to activating 12V Repair mode; otherwise, you risk damaging your vehicle's electronics.