The new USB Rechargeable Battery powered emitters are direct replacements for the AA-size and C-size battery powered emitters. The USB battery slides into a battery slot and is held in with a snug connection. This is an improvement over the previous models holding a single battery firmly in place. No chance of inserting a battery backwards by mistake which could happen when inserting four batteries in an older unit. With each emitter, the USB Battery is included with the emitter and priced the same as the previous models.
A full charge varies based on number of beams and IR power level of the unit. Here are results from battery charge testing in the lab. Battery charge times are measured as continuous ON time with a full charge:
5040C single beam -- 55 to 60 hours
5050C high power single beam -- 55 to 60 hours
5042C double sided beams -- 55 to 60 hours
5052C high power double sided beams -- 50 to 55 hours
5063LU/RU start line Stage/Prestage dual beams -- 50 to 55 hours
5054LU/RU start line Guard/Stage dual beams -- 50 to 55 hours
5067LU/RU start line Guard/Stage/Prestage tri-beams -- 35 to 40 hours
From full discharge, the USB battery can reach a full charge in under 8 hours using a standard USB charger. Charge cable is included. Just like the AA and C battery models, it is a good idea to have a spare battery charging while the main battery is being used.