I use the rechargeable, because I thought it would be cheaper than buying and replacing normal AAs. However, on buying Power Functions pieces, I was surprised by how good the battery life was.Also, the rechargeable can be plugged in whilst using the NXT, so it can be useful for robots on for a long time.If you leave space on your bot for plug access, it can save you having to destroy your robot to change batteries! :DPe-ads
The better batteries are the Lithium E2 Energizers compared to the alkies is nite and day, pluss the E2 Lithium have 1.7v that puts the NXY at it top V of about 10.2 and weighs less than all and any other battery made. These are toss away i use them when weight, size and power is needed. Every day use i just use NiMH
I prefer to use normal NiMH batteries as they are much better in some ways than the battery pack. Most NiMH batteries are 1400 mAH (mine arn't though...) and have a higher voltage than ~8.2 (About fully charged). The battery pack also seems a bit more pricey than normal NiMH.
If I recall properly, I don't believe the NXT rechargable gives full power on the first couple of uses. If the test didn't account for this the results could be off somewhat.
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