A 'trickle charge' mode would be nice, where you could program it to charge over a set number of hours in order to keep the battery warm. For instance, I drive about 14 miles to work. Even on 120V at 12 amps the battery is fully charged in about 4.5 hours, but I don't get out of work for around 9 hours. I dialed back the charge to 6 amps today and it kept the battery warm over that ~9 hours without getting to full charge. Would be great if there were an automatic way of doing it where you could program a steady charge to finish at a set time or set number of hours (not a delayed start) so the continuous charge would keep the battery warm (or cooled in the summer).