The charger for SRAM eTAP and AXS is a super simple docking station style of charger that works in 45 minutes or less. eTap batteries are literally a snap to remove and charge.
Just flip the tool-free battery latch up and slide the battery up and out of the derailleur. Then snap the battery into the USB-powered charger and connect the charger to any USB power source or A/C USB adaptor.
A full charge takes just 45 minutes to complete.