NOCO GENIUS1 vs GENIUS2 vs GENIUS2D: Best Trickle Charger for Your Battery? The NOCO GENIUS1 is the better pick for maintaining a small 6V or 12V battery that sits for months because its 1A output and 15.2-ounce body make it the easiest to store, while the GENIUS2 suits faster recovery work with double the current … Read more