RECHARGEABLE ALKALINES IS ONE OF THE WORST IDEAS IN BATTERY TECHNOLOGY IN THE LAST 30 YEARS.
While iGo would like to market it as new technology that the big battery makers don't have, that's far from true. Rechargeable alkalines have been around for over a decade, and is actually a failed technology. The major player was Rayovac, with their Renewal™ batteries, but they abandoned them long ago.
The biggest drawback of rechargeable alklines -- AND IT'S A BIG ONE -- is that you have to recharge them when they're about 25%-50% discharged. If you wait until they become depleted or near depleted, you've damaged the cell, although some may be saved through several deep discharge/recharge cycles. In other words, rechargeable alkalines are high maintenance. That's especially ironic because most people buy normal alklaines because they need so little maintenance, i.e. a long time between changes.
Here are some data from Wikipedia, keeping in mind that alkaline's full charge is actually 1.5V:
"If they are discharged by less than 25%, they can be recharged for hundreds of cycles to about 1.42 V. If they are discharged by less than 50%, they can be almost fully recharged for a few dozen cycles, to about 1.32 V."
The battery becomes so damaged that it can only be charged for a few dozen more cycles if you let them discharge to about 50%??? Keep in mind that NiMH batteries can be recharged for 500-1000 cycles. In other words, if you want your batteries to be rechargeable for several hundred cycles, you need to recharge them BEFORE they are 25% depleted!
To see why this is a major problem, consider how few battery-operated devices actually have an accurate battery meter. Flashlights, smoke detectors, remotes, etc don't have them so how would one know when they're 25% depleted or 50% depleted? Even the meters in cameras are very approximate. And if you have to recharge them before they're 25% depleted, then they last no longer than ordinary zinc carbon batteries in actual use. So the whole selling point of alkalines is eliminated.
I can't see any device where these would be advantageous.