Yes the battery may be awesome, but the plastic battery holder… It will never pass the current required for moving multiple servos on a walking robot. There is too little surface contact on those little springs.
Well I’m gonna have to adapt a Tamiya to Barrol Plug then arnt I.
Looks like it is definitely loosing power. Get rid of the plastic battery holder and use nice thick battery wires soldered to the battery pack or get one of Lynxmotion’s battery packs hat have the connector already soldered to the packs. Once you have the power sorted out, it will make your life a little easier. My 13 servo brat worked fine with a single 6v 1600 NiMH battery pack lynxmotion sells. You will also need a wiring harness to fit the battery recepticle.
This:
And this:
About the steps, you will need to keep the hip servos positioned so that the torso is close to being level with the ground. It’s ok if it is leaning forward a little bit, but you don’t want it to bow down with every step. 
Good work so far. Considering this is the first propeller brat I have seen so far, and the fact that you are in fresh new territory I have to hand it to you, you’re doing a good job.
Thank you, I think that encouragement was just what I needed. 
I have both the 5 cell powerpack that I bought separately and the switch with wire connectors that came with the brat kit (Both images)… But the MSR1 has bad powering options, I think the next stingray kit will come with an adapter as alot of people are complaining about it on the prop forum.
Anyway I’ve ordered the parts I need and a soldering iron, so by Tuesday it should be here and Ill cook something up.
Thanks again 
Yeah really good work Nishi, my programming sucks so your doing better than me. nice work.
Thank you!
OK So progress wise, I had to order a few parts and make a tamiya to barrel adapter which worked out OK for my first ever bit of real soldering, but then I dropped my robot! … from about 1 cm in the air on his left ankle… and it went limp… 
SO I ordered a new one and waited… then had to move living conditions and work, life etc… got my new ankle servo and while I was changing it (I didn’t unplug the battery pack) smoke started coming from everywhere! (… well the battery and circuit board)… I’d been leaning on the barrel head that was already quit delicately soldered together and I’m guessing I pushed positive and negatives together or something but the power pack plastic is well melted. I ripped the pack out and I’m sure I saved the PRCB… Anyway I’ve ordered another pack and I’m waiting… again…
What’s that saying?.. Less haste more speed
You can see I’ve mounted the ping sensor too… he now resembles that BRAT configuration I first fell in love with.
We have all… at some point… let out the magic smoke as we call it. If you work with this stuff long enough, at some point you will encounter the 'ole magic smoke.
The brat looks great! Hope he gets back on the assembly line soon! 