I would recommend sticking, for your first machine, with as similar spec as you can. Stick with 4S (which is the cell count in series, meaning 14.8v) if that is what the various components in your robot can take, namely your motors and speed controllers. I would say perhaps this -
https://hobbyking.com/en_us/turnigy-...ack-xt-90.html. Only slight hiccup is that the battery appears to only be in the EU, not in the UK so the delivery charges are going to be more.
If you are not going to have a linear actuator, I know that at least 2100mAh is OK,
The Honey Badger used 2x 2S LiFe batteries in series originally and even
Azriel, with its axe, still uses 2100mAh LiFe batteries in 5S LiFe (2S and 3S in series). If you are going to use a linear actuator, I would recommend at least 3000mAh.
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