Westward 6V/12V 55A Battery Charger & Maintainer - Heavy Duty Car, Truck, RV, Boat, ATV Battery Charging & Maintenance for Reliable Starts

First off, the wire sizes are fine. The A/C power cable is 18 AWG; while the D/C charging cables are 14 AWG.For reference, the guages of the Schumacher model that I'm replacing (the Schumacher brand isn't what it used to be, I've gone through like 3 of them in the last decade or so; while an old 70s model which was unfortunately lost/borrowed/stolen likely still works), are 18 AWG for A/C and 16 AWG for DC.If you don't know how guages work, a smaller number is a larger/heavier guage.Furthermore, lower voltages require heavier guages; this is why the higher voltage 110v A/C cable can be a lighter 18 guage.The unit is slightly heavy, which to me indicates that it's well made, and will charge reliably for years to come (unlike the pictured schumacher, which "works", sometimes, when it feels like it). It has a manual control switch, which means fewer cheap electronics to wear out prematurely (unlike another schumacher model not pictured but the most commonly available).Aside from the charging guage, there are also led indicator lights, which I like. No need to try to guess which mode the auto charger is in. And the guage reads accurately (unlike that of the pictured Schumacher).5 stars, would recommend. If I have any issues with it I'll update my review, but I don't anticipate any.