Hamilton The Shiv™ Battery

Great Battery

Great Battery with adjustable voltage and puff counter

Good battery

I wanted a compact heavy piece that fully retracted the mouthpiece, protected the cart and had volt control. The Shiv delivered. It even prevents you from damaging the retracting mechanism by detaching it and letting it freely move if pressed to hard while extending, but if you gently pull it while out it'll reengage the mechanism.