I am working on a car using 2 DC motors , one servo , 4 batteries each 1.5 volt , first when I wired the first motor it works but when I wired the second motor to the shield nothing worked , I think that happened because of the batteries but I am not sure what should I do ? , Thanks in advance for helping me …
@Sondos, We suggest you to open a topic on our RobotShop Forum for proper help as going back and forth here is not easy.
Is it OK to Replacing the 7.2v 800mah li-ion battery pack w/ 7.4v 2000Mah for jvc dv camera ?
@amir: It is most likely not a good idea to replace the battery pack with a different one. The discharging of the new pack might be fine, but if there is charging circuitry inside the device, it most likely will not be able to handle a different battery pack than the one it was intended for. We strongly recommend against this as it could cause damage to the battery pack, the camera and its users and other issues such as possibly catching fire.
I am trying to make a vacuum cleaner. I am using a battery of 12 dc Volts with RPM greater than 6000. Please help me choose a battery for that!
Sir, you have done a great job! Keep it up! Best part is that you make sure to reply to others and help them!! Keep up the good work Sir.
@Shourya The choice of battery will depend on many factors. For a Vacuum, we suggest as 1V NiMh or 11.1V LiPo. The capacity will affect the weight and discharge rate (i.e. maximum current).
hay, great stuff. can ask is it ok to us a 9.6v 800mAh in a rc car that came with a 3.7v 5mAh battery? thanks
@dwain 3.7V 5mAh sounds way too small to be useful. Do you mean 500mAh? If the electronics / motors operate at 3.7V nominal, 9.6V may fry everything.
greetings
Greetings, firstly let me send towards you blessings for this very well assembled and informative rare piece of gold. Secondly i was wondering how to calculate capacity for alkaline batteries they do not have any info about mAh. Thankyou 
@shahmed From what we understand, you have a battery but do not know its capacity? Ideally the manufacturer should provide this data, but we have seen that many suppliers specifically leave this out; we suspect this is done because there is a lot of contention among battery suppliers to put a “real” capacity - in the past, certain manufacturers have put values which would increase sales, but which could not be reproduced. As such, many of them simply add terms like “high capacity” or “long life”. You should be able to write to the manufacturer to get them to at least give you an idea of the capacity and if not, you may want to consider a different brand.
Greetings,
I have an ATS controller with a power 8-36VDC, Max 1.2A. What battery should i used and rating? We test 2 pcs Sealed maintenance-free-lead-acid battery in series connection 12V/1.3AH/20HR but it doesn’t work. Thanks.
@Renante Quintano You want to power the ATS using a battery? Not sure why the lead acid battery would not work (are you sure the battery is 1.3 Amp hours? that seems low).
I have a 7.2V motor what has been used with Ni-Mh AA P 400mAh 7.2V battery and i want to change it to working with usb so i can plug any powerbank to it what has 5V. Is this ok or do i need something in between and can the motor get enough electricity to work?
@Arto Varonen The motor will likely operate at 5V, but at lower efficiency. You need to know the maximum current which the power bank can provide in order to know if it can work with the motor.
Hi,
I am building a robot fro my school project, it has a two 12 volt dc motors with encoders to drive the robot around using tank treads. the robot will weight about 1Kg. What would be your suggestion on the voltage and the Ah of the battery? I was thinking of using a 14.8 volt LiPo battery with 3300mAh.
@Sam If the motors are 12V nominal, then it would be best to use an 11.1V LiPo. Note that the capacity determines how long the robot will operate, but the higher the capacity, the heavier the battery. 3300mAh sounds ok.
i have a modem with a input 9v - 0.6a if i want to run in battery when power is down for 1 hr. how much v battery should i use… ??
@arshad There are not many 9V batteries which are useful for things other than small electronics. You might need a higher voltage battery and a voltage regulator. If your device consumes 0.5A, you’d need a 0.5Ah battery.
hi coleman,
im using portescape 30gtr82 dc motor . i am unable to figure out which battery to use.
i want to make my device portable enough.
@PUSHPDEEP P MISHRA We cannot seem to find that prodcut online. Choose a battery based on the motor’s nominal voltage. Within the specs, it should give you the current draw at maximum efficiency. Therefore the battery capacity can be calculated as current draw multiplied by the number of hours of use, multiplied by the efficiency. For example if a motor consumes 2.4A, you would need a 2.4AH battery to have the motor last 1 hour. You also need to check that the battery’s discharge current is enough for the motor.