### Author Topic: Battery question  (Read 555 times)

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#### George221

• Jr. Member
• Posts: 10
##### Battery question
« on: February 27, 2013, 04:20:11 PM »
i have 6 Polymer Lithium Ion Battery - 2000mAh and 3.7 V
(http://www.azlabs.net/store/index.php/polymer-lithium-ion-battery-2000mah.html)

and i want to use them to control two stepper which required 12V and 0.68A
(http://www.robotshop.com/ca/rbsoy14-soyo-unipolar-stepper-motor.html)

do i need a battery with above 0.68A to run the stepper?

do i need to make the battery in parallel to have above 0.68 A current to run the stepper or make three of them in series and run with 12V and 2000mAh

#### Azraels

• Full Member
• Posts: 57
##### Re: Battery question
« Reply #1 on: February 27, 2013, 05:35:35 PM »
2000 mAh = 2 Ah

2 steppers at .68 A each = 1.36 A

the batteries will work fine

run batteries in series for 12 V

If your first post is, "I want to build a super complex robot with object recognition, etc..but I have never done programming or electronics...etc."
Your doing it wrong. Start Simple and Work Up.

#### jwatte

• Supreme Robot
• Posts: 1,345
##### Re: Battery question
« Reply #2 on: February 27, 2013, 10:55:22 PM »
Three batteries in series to get to 12V.
Two such strings in parallel for longer runtime.
Usually no need to separate different batteries for different motors.
Also, what is the C rating of the batteries?
A LiPo can typically drive its mAh rating in amps well - this is known as "1 C."
Many modern batteries can drive more (but for a shorter duration.) For example, a 20 C, 2000 mAh battery could drive up to 40A of current without overheating/safety concerns.