안녕하세요 프리퀀스입니다.
현재 Boxer Mod D18J는 gingervaper에서 독점 판매중이라 '생강담배'싸이트에 채팅문의해봤습니다.

답변은.

hello.  No you can not use usb port for charging.  You would need balance charging board and there is no room in unit for that.
batteries must be swapped out to charge and use external charger

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(요약) 안돼...ㅋㅋㅋㅋㅋㅋㅋㅋ

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(원문 - Boxer Mod 150W DIY Kit with YiHi SX350J Temperature Control Chip)

•Powered by the 2nd generation YiHi SX350J mini processor

•Variable Joule & Variable wattage

•200°F-580°F /100℃-300℃

•Maximum Watts: 150W and future upgrades will be available

•Dual Battery 150W regulated, 170W in bypass mode (direct connection mode) allowing your device to become a mechanical mod

•Dual Battery 150W regulated based on 2 x 18650

•Output Voltage: 1.0 – 9.5 volts

•Resistance: 0.05 – 3.0 ohms

•Buck-Boost&Boost, DC-DC Converter

•Five modes: Powerful+, Powerful, Standard, Economy, Soft

•USB for software updates only, takes two (2) 18650 Batteries  <----요기..

•Plastic Nylon Body

•Ergonomic design

•Joules Display

•Rotary Display

•Gravity Sensor System (Adjust the wattage without the need of the +/- buttons)

•Upgradable software/chip

•Graphic User Interface

•Reverse Polarity, Output short, Low resistance, Low battery Voltage and Overheat protection

•OLED 0.91″ Screen

•Dimensions: 80.5mm x 41.5mm x 39.2mm (3.17″ x 1.63″ x 1.54″ appox.)

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잠시나마 생각해봤습니다.

USB 출력이 5볼트니까... 직렬구성시 7.4볼트인데 이 전압을 보강해줄수 있는 브리지회로등 보완사항이 없어 안되는게 아닐까...
사실상 직렬구성 시 저전압 상태로 봐야할듯한데...  오래걸리겠지만 될거같기도하구요... 

최악은...  배터리가 더 크니 역류하지않을까... 싶기도하네요. 음..저도 전자공학인데.. 왜 하나도 기억이안나죠...ㅋㅋㅋ
(스파크가 튀지않는한....)

그냥 짧은 머리로 이리저리 생각해봅니다.

그나저나 이내용도 팁이 될수 있을까 해서 여기에 남겨봅니다.