@Jasper The voltage needs overlap between 4.8V to 6V, so you can choose a 4 or 5-cell NiMh pack. You need to sum the max current from each actuator in order to estimate the battery’s max continuous discharge current. The capacity will determine how long it lasts. Take a look through this article for details.
Hello Mr Coleman, I have a remote controller running with 8 AA nimh batteries 2700mAh. I’m planing to use a Lipo of 7.4 v 1600 mAh will be enough current?
Thanks.
@Jc Normally LiPo can discharge at much higher current than NiMh, and RC remotes tend not to consume much current. 1600mAh vs. 2700mAh means it will not last as long though. For an RC remote control however, 1600mAh should be fine. Just be sure to recharge it regularly.
Hello Coleman
The motors I have are rated are 24V 200W 2.5 Amp max. But the batteries are on the market are rated in amp hours. How do I know which to pick?
How do i see the amps rating in my battery if its only listed in amp hours?
@FaresWheel The two are not directly related. Note that if the motors are 200W at 24V, the max current would be ~8.3A (stall). The battery’s capacity (i.e. stored energy) is measured in amp hours and you should also look up its maximum discharge rate (units are “Amps”). The battery needs to be able to discharge at your robot’s total current requirement, and the capacity determines how long the battery will last.
@Rinkle A battery’s capacity is measured in “amp hours” while the discharge rate is measured in “C” (or amps). If you do not have a number which says something like 5C or 10A, then you need to contact the manufacturer / seller in order to know that battery’s maximum continuous discharge rate.
@Coleman Benson
Ok I see. The battery I’m looking at is described as having “85 Amps 10 seconds”. Do I divide 85 by 10 to get 8.5?
Sir, what volts of battery is required to run one servo and one 6v motor via L293D motor driver. I’m using an arduino uno for my RC car. Please help!
@Subha das If you want 6V nominal, and the current drain is not too high, 5x 1.2V rechargeable cells gives 6V, or 4x 1.5V alkaline cells.
@FaresWheel No - that means the absolute max continuous discharge current is 85 amps for 10 seconds. It sounds like a Lithium based battery.
I am trying to figure out the battery I need for my robot arm and I dont see nominal load current but only find current drain, no load or idle. I also found another one called stalled which is way higher. Can you tell me if I should consider my worst case as the stall current? If I do I would need a very powerfull battery, for example for the hs 5085MG the stall current is 3 amps! Also that information (stall current) isnt available for all servos…? thanks for helping!
@pablo If there is no data about current draw, but there is data about stall, you can estimate the max continuous current draw to be around 1/3 the stall value. For the 5085 (a small but power hungry servo), estimate the drain at 1A under load, with some fractional second spikes going higher (especially when it starts moving)
i’ve build a quadcopter with 4 coreless 3.7v (rated current 100mA). I’m connected the motors with 3 AA battery( each 1.5v ).but my quadcopter isn’t flying…do i have to use more AA battery…??
@Mahir Syed It sounds like you are using both the wrong motors and the wrong batteries for a multi-rotor UAV. We invite you to create a new topic on the RobotShop forum and provide details of your setup, as well as photos.
I want a battery to support 5 motors all using 3 A continuous current. Another battery for 4 motors (3 A continuous current) and 5th motor with 13 A peak current required for 10-20 seconds only. Kindly suggest the two batteries.
@Tushar Rather than a specific battery, you need to figure out if it can be a single battery (i.e. single voltage) and the total maximum continuous current it needs to be able to discharge. At the current you describe, you’re likely best with Lithium (mobile robots) or lead acid (stationary, or large mobile robots). If your motors have different input voltages and you need to have only one main battery, you’ll need high current voltage regulators.
I want to power three 4.8V mg995 servo motors and two 12V dc geared motors each having max load current upto 600mA for mobile robot vehicle, please suggest me an appropriate rechargeable battery, I’m new to robotics. Arduino mega is used as microcontroller board.
Sir,
I am making a line follower
It has 6 ir sensors arduino board and 2 150 rpm motors (3v to 12v)
I want it to last for around at least an hour.Neglecting the sensors .what battery should I use.i was thinking to get a 1500mAh lipo 3s 40c.Will that be enough
@Rover C J Those servos operate best at ~6V, therefore if you want a rechargeable pack, you should consider a 6V NiMh (5 cell) pack which can discharge at 2A max. The capacity is up to you (though it is related to the max discharge rate). The question becomes how to power the MEGA since the barrel connector is meant for 7-12V. You can a step-up voltage regulator (Vin pin on the MEGA) so you only use one battery. https://www.robotshop.com/en/power-systems.html