Let's Make Robots!

wild thumper battery and project help

I'm looking to build a internet controllable robot that uses a microsoft kinect, opencv, raspberry pi (or pandaboard), a wild thumper controller, and a wild thumper chassis. I would like to keep the raspberry pi continuously powered and have it turn on the wild thumper controller when it needs to move. I'm very new to building robots, and more comfortable with software than hardware. 

I'm looking for a battery that I can leave plugged in to the wild thumper controller. Can I do this with a nimh or li-po. Is it safe to do this? Ideally, I'd like to only re-charge the batteries every few days. 

Any information or general tips for my project are greatly appreciated. Thanks so much! 

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While the wild thumper will be happy running off of a lipo, you would be unable to use the charge feature of the board. I would look more to large RC car packs (ni-cad etc) or simply a large SLA. 

I should say that if you are new to robotics (even with a software background) this project is a bit ambitious for a first time out. Good luck though.

Totally understand the ambitiousness of the project, and fully expect a long road to produce the robot that i want :)

Is there a specific battery that you can recommend? I just found this one http://www.hobby-lobby.com/12_volt_7ah_sealed_battery_1035447_prd1.htm

I expect to power the wild thumper board ~45 mins a day. It'll be operated in a home, so would like the battery situation to be as safe as possible. 

Thanks again for your help, Chris! Appreciated your wild thumper review @ http://letsmakerobots.com/node/24368. 

That is going to be the safest battery you can use. From here, you will just need to do your math on capacity and how much current you intend to draw to figure total run time. It is really going to be a good guess in the end --motors will not be on all the time, different parts of the robot will be using different amounts of power at different times etc. Bottom line, as always: 7Ah is 7 amps for 1 hour or 1 amp for 7 hours. 500mA for 14 hours, etc.