Senior Airman David Stricker performs an electrolyte test on an aircraft battery in the 437th Maintenance Squadron Electrical and Environmental Battery Shop Feb. 11. The ELEN battery shop is responsible for maintaining all the C-17 batteries for Charleston AFB. Airman Stricker is an electrical and environmental systems journeyman with the 437 MXS. (U.S. Air Force photo/Airman Ian Hoachlander)