Update: Since my motor-shield driver has only 2 connections to connect a maximum of 2 motors. Im going to use only 2 Motors. So, I guess I will be going with 12V each for both the motors.
12V 2RPM DC Motor + 12V 300RPM DC Motor
Both have extended gear box for high torque.
Since you didn't tell us what the motors should do, it's hard to say if a solution is good enough.
Thank you for taking the time to reply, Couka. Appreciate it.
As mentioned earlier in the above post, I'm building a RC truck with some functions that carrys objects and run forward and turns. Similar to a crane. For these, I planned to use 2 different motors. 2RPM for high torque to lift and other 1 for movements.
When I searched online for 12V lipo..that time i was only able to get 11.1v and the seller told me at peak charge it will supply 12v.
But later I found a 12v power supply here :
http://www.ebay.com/itm/High-Power-12V-Rechargeable-Li-po-Battery-for-CCTV-Cam-6800mAh-Useful-/301776949619?hash=item46434ed173:g:OisAAOSw14xWKcWn
Will that be suitable ?
I haven't seen any replies addressing the fact that the OP plans to power the UNO (or Pro-Mini) from the same battery powering all the motors. I do see an issue there with the motor noise generated and it's effect on the uP. Motor spikes on the UNO regulator input could result in errors or resets unless you add some substantial filter caps (470 uF or greater).
Thanks for taking the time to reply, Raschemmel. Appreciate it.
The motors will be driven by a dual H-Bridge motor-shield via arduino and
I planned to use a step-down buck that converts the 12v to 6v to powerup the uno or pro-mini. But I didn't know the spikes will affect the board. So, Do I need to add a 470 or 570uf ? Please advice.
Updated Part List:
1.) 12V DC Motor x 2
2.) H-Bridge Motor Shield
3.) 12V Lipo battery
4.) 12V to 6V Step-Down Buck for powering arduino..etc.
5.) Arduino UNO or Pro-mini ( obviously )
6.) HC-05 Bluetooth Module