Be cautious using the pass through, it's really risky, as the battery has incoming amperage and outgoing. Overload the battery and it goes boom.
Pass through is one of the highly frowned upon features in any mod.
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Well that might be your opinion and your more than welcome to it however the
"pass through" in my book is a
highly sought after feature and is about as dangerous as using your cell phone, ipod, ipad, laptop or just about any other modern electronic device with this same feature.
If your battery is to low to fire the device
the 'pass through' won't do you much good until the battery has enough minimum charge to fire the device but unless your "chain vaping" having the device plugged in will eventually put more energy in than your taking out while vaping.
Some/many of the dual battery and/or higher powered devices skip this feature as it adds cost and their target audience are more likely to simply swap batteries than scramble for a charge cord. (and wait. 'Standard' USB charging is limited to 0.5A @5V while external chargers can charge at a much higher/faster rate)