The TT28-12 True Blue Charger PRO is specifically designed to charge and discharge, as well as test the TB series lithium-ion, aircraft batteries. This charger is easy-to-use and capable of automatically discharging lithium-ion batteries to 30% state-of-charge, as required for air shipment. The True Blue Charger PRO comes pre-loaded with all the parameters for charging and discharging True Blue Power lithium-ion batteries, allowing maintenance personnel to safely and efficiency top charge batteries and perform scheduled capacity checks.