(If you are using this battery box for other QRP radios, please note the order information to get accessories for related cables, thank you). Customized for KX3 transceiver, X3 LI-ION BATTERY BOX is of aluminum alloy body, can pack nine 18650 Li-ion batteries, is of built-in protection circuit, and can supply sufficient power for KX3. It is connected with KX3 transceiver through two shaft connectors. It serves as a mount after opening and of the consistent overall dimension with KX3 after closing, to facilitate portable use and storage. This battery case is very sturdy and can also be used for the LAB599 TX-500 and other portable radios that require an external battery. Remarks: box without battery, please choose the original battery without protection plate, the length is 65mm, Every time you take out the battery and then load it, you need to activate the protection function with the original charger, otherwise there will be no voltage output. Rated Output Voltage: 10.80V. Capacity: 10.20Ah / 110.16Wh (1). Output Voltage Range: 9-12.60V. Limited Charge Voltage: 12.60V. Maximum Discharge Current: 10A. Overcharge Protection Threshold: 12.60V (±0.15V). Over-Discharge Protection Threshold: 8.70V (±0.15V). Protection Function: Short-Circuit Protection, Overcurrent Protection, Over-Discharge Protection, Overcharge Protection, and Balance Protection. Net Weight: 0.4Kg (without Battery). Overall Dimension: 196×88×35 (WDH, mm). Calculate as per nine Panasonic NCR18650B 3400mAh Batteries. Packing List: (If you are using this battery box for other QRP radios, please note the order information to get accessories for related cables, thank you). X3 LI-ION BATTERY BOX (without battery) × 1. Charger × 1, Shaft Connector × 1, Thumb Screws × 2, Allen Wrench × 1, KX3 Power Cord × 1, Power Cord for Spare × 1, Balance Charge Cable × 1, User Manual × 1.