Hello!
  Evreybuddy!!!
   I'm very very new beginner in this subject. I found good deal from these two leader merkettiers in RC Hobby.Just check it & throw Your MH (Metal Hellide) Light shedow on the Subject..

1. http://www.dealextreme.com/details.dx/sku.5105
2. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6563

   It's very helpful to write down here about this type of battery & its charger. DIY for battery pack & charger are most welcome...

I'm also using this battery for Rx and they are really good. Here is the picture of self made Rx pack of 6.6V 1100mA, this 2S LiFePO4 pack weight 106 grams including all those wires and connectors. Futaba 4.8V 600mA Rx pack weight 86 grams, I could save couple of grams by shorten the length of those wires. Best features of this batter are can be fully charged within 10 to 15 min and also not required any VR. Self life is more than NiCad/NiMh/LiPo/Li-on.

Wow Rajib !!  If that is self made you are really good.

why don't you start selling them ? - I'll buy a couple.

hey thats a good DIY. I am trying to find Futaba battery connectors for a DIY battery charger. any idea where i can find one ?

Do you mean Futaba J pigtail? You can find them at www.rcdhamaka.com

thanks Rajib