Links broken but I found the item anyway.

Yeah I was looking at that very one earlier today. Auto cut off, small and 4000mAh so it should be fine. The only concern I'd have is I can't see that it has a balance port which could mean unbalanced charging and reduced life, but it's not that big of a concern to be honest.

Edit: My mistake, it looks like it may have the balance plug after all.

Cheers, which do you think would be the best out of the one you linked and this? They both cost about the same. I suppose it's a choice between size and mAh? I may need the extra space

Been ordering quite alot lately will update my shopping list in the near future. Now It's time to start updating the robot shell whilst I wait for all my parts to come.

Sorry for being such a noob but how does the balance plug work? And how would I know if it has built in monitoring?

I didn't link to any battery did I?

it is a trade off between size and capacity. 4,000mAh should be plenty, I use 5,000mAh in Melvin and he lasts days before requiring charging.

The balance plug... The LiPo battery is 2 cells in series. So imagine 2 AA batteries in series, you have your -ve, +ve, -ve, +ve. From the two outer most terminals you have the combined voltage of both batteries, or cells. That's great for powering stuff but not so good for charging. The balance port is 3 wires, one from the outer most -ve terminal, one from the outermost +ve terminal and the third from the middle of the 2 cells, where the -ve and +ve join to make it series. Using this plug the charger can monitor each cell's voltage and charge the battery in such a way that cell 1 and cell 2 have equal voltage, or are balanced.

This probably explains it a lot better than I can.

No link lol, just copied n pasted. Thanks for explaining it for me, made perfect sense.

So my EZ-B board requires 7.2v @ 3amp, if I use a 7.4v battery @4amps will I have any problems? Am I right in thinking that the ez-b will only use the amps it needs to power boards, servos and camera and wont use anymore than that?

@dkennyken ... You are correct... Ah or mAh is the battery's capacity... The higher the mAh the longer the battery will last given a specific draw... Now mA or A is the draw of a device so for example if your EZB draws say 100mA (just made that # up) then your 7.4v battery with 4Ah capacity will last approx 40hours or 25% longer than the 7.2v 3Ah battery (voltage being nearly the same of course)...

You can get a ton of information by watching and reading the tutorials.

good Luck!

:) looking forward to getting started. Much appreciated for all the advice, thanks. I'll take a look at the tutorials.