Battery Devices:
Innokin iTaste VV3 - compact form factor like your current eGo battery, but with additional options like variable voltage/wattage, LED digital display, built-in ohm reader, battery voltage indicator, protection circuitry, and usb charger which you can use while its charging. Only 800mAh battery capacity, so if you aren't around a USB power source you'll likely need two to last all day. Larger tanks may look awkward on the slim battery.
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Innokin iTaste MVP2 - a box mod format which is still pocket-friendly and lightweight. Huge battery capacity (2600mAh) which should last 2 - 3 days on a charge, can also be used while it is charging on the USB charger. Variable voltage/wattage, built-in ohm reader and battery voltage indicator, protection circuitry. Can be used to charge your cell phone or I-Pod in a pinch.
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Segelei ZMax - Tube-style variable voltage/wattage mod which uses replaceable rechargeable batteries; you need to buy IMR rechargeable batteries and a box charger in addition to the mod. Built-in voltage and ohm meter. Protection circuitry. Available in a 18350 battery Mini, 18650 battery full size, and a telescopic version which can accept 3 sizes of replaceable batteries.
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