Instruct: Classify Amazon reviews into positive or negative sentiment
Query: All you need to keep your car battery ready to go!

This product for being so small packs a big punch! I have a Dodge ram that I may drive but once or twice a month so my Optima battery was always dead when I needed to use the truck. The battery was completely dead when charger arrived ( under 3 VDC actually 0.2 VDC) used the battery terminal fixed mount harness provided with charger instead of alligator clips, charger would not turn on because of the batter state. I used a regular charger to bring the voltage up above the minimum 3 VDC and then connected the battery tender and let me tell you it took three days to bring the battery voltage to 12.6 VDC shortly after the charge was complete and the battery tender automatically switched to trickle charge mode and has not let me down in the five weeks of using it.