Working with Allen Energy, the EnerSys representative, and Columbia Vehicle Group Inc., the burden carrier manufacturer, American initiated a TPPL battery trial at Charlotte Douglas International Airport. For the trial, two Columbia burden carriers were each outfitted with four NexSys PURE TPPL 12-volt batteries. From May 2015 to May 2016, the carriers were used to ferry passengers around the terminal, and the batteries ran as promised, with no issues or unexpected downtime.