Hi Olivier,

I have been using the Black&Decker VPX battery too (but only in a VPX tool).
Seems like BnD is taking them out of the market, they are more and more difficult to buy. Apparantly the VPX tools haven't been a real commercial success.
Why not buying an R/C worthy pack like from http://www.rclipos.com/A123.htm ?
They have all thinkable combinations with the 1100 and 2300 cells.
Their product, quality, service and price is top notch, and shipping worlwide is free.
(Also SinCity Jets have such packs, but I don't think in 1100 MAh packs)
I would be scared to convert a VPX pack for R/C use... (the A123 cells are in my experience quite sensitive for DIY soldering)

PS. I am using some 30 pcs A123 packs at the moment, and use them in all kinds of applications (even where people would use a lead acid car battery). I find the 1100 series a bit "weak" under high amps, especially for an RX in a jet. If one of the two (redundant) packs fails, I have my doubts if the second pack (of 2S 1100 MAh) would be a solid safety net... Just my personal feeling (and the graphs will be against me)... As long as the redundant packs support each other, it will be fine...
I am using a single 2S 1100 pack in a Savex L-39 but that's about the maximum jet size I would dare to go with these...

Nicolas.