Electric jack - unrealistic expectations or bad unit?

Battery test comparisons have consistantly shown the Wal mart batteries to finish at or near the top of the pack. No surprise since their batteries are made by the same top companies as other brands. Combined with ease of battery exchange in case of failure because of nationwide stores, many open 24hrs, 3 yr free replacement for the Maxx, this is an easy choice for me. Now if you boondock a lot it might be a different story as you would be looking at specialized batteries (6V, AGM, high-capacity, etc.).

Steve