They added some features. The button lights up, and now they will tell you approximately how much charge the battery still has. The upgrades also feature an on/off mechanic, where you click five times to turn the unit on or off.
The upgrade model also lets you turn on unregulated mode. That means when the battery is freshly charged it will give you more power, and a slightly better vape.
-sent from my Sony X10i using this Tapatalk thingy
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