Anton/Bauer's LPD Travel Discharger discharges up to four V-Mount batteries to be compliant with travel restrictions. To be shipped or otherwise transported, lithium-ion batteries may be required to be below a 30% charge. Mount the batteries to the discharger, and they will be systematically discharged until they are below 30% of capacity. This unit is powered by the discharging batteries and does not require an external power connection.