FF Battery ?

small, light, powerful. No corrosion issues in two years of use, sealed tightly in a water tight box.

Cost?  Charger?

$72.00 without the charger..

small, light, powerful. No corrosion issues in two years of use, sealed tightly in a water tight box.

yo Porky, where you get that??!!

I got the Battery at Tower Hobbies.
The charger too.

You can also go here for good prices:
http://www.all-battery.com

or shop your local battery shop/Hobby Shop

Many places online you can get LiPo's built in all shapes and sizes with your desired voltage rating..

Powerful, small, light and will last a long time on a single charge.

I got tired of messing with the AA's so almost bought a LiPo setup, but one of the smaller SLA's from Fry's has worked great...  multiple days OTW per charge, and under $20.  Fits in the same LocNLoc container.

You can also go here for good prices:
http://www.all-battery.com

I personally had a very bad experience with Tennergy batteries.  Purchased 30+ of them for my first FF and some extras for flashlights, etc.  None of them worked up to their rated capacity, even with several refresh cycles on my inteligent battery chargers.  All were garbage so I wrote them a nasty letter and got a refund.  I considered trying some of their other battery packs, but since they seem to all be made by Tennergy I'm not wanting to waste any more money on them. 

Sorry to be confusing, My Battery is actually a Reedy.. Top Notch!