Mtr(mechanical Tracked Robot)

Just discovered that even with 2 batteries, there's still a huge voltage drop. Is this safe? I'm using 2 9.6V Ni-mh 1000mAH batteries. Should I change to another battery type? What type?

Technopro, I usually run Ni-Cd 2000 on Captain Ann, but when I run NI-MH 2800 I realize less servo chattering. My Mini 6 ran better with Turnigy 1700 LiPo than the others. Had no problem with duration on any of the options. Steve S

You need to find out how much current your motors are using. A bench power supply with both voltage and amp displays could help in this case. Or possibly a digital voltmeter with at east a 10 amp rating for reading dc current.

Ok And I would put the amp meter before the main circuit right?(before devices tie into power)

That would be good. You want the meter in series with the battery and motor.

Hello,

I'm not sure that I fully understand the issues so take my comments with a grain of salt. The battery looks suspiciously like one that comes with a toy truck. I believe Ni-Cd and NIMH batteries don't hold a candle to Lipo's. Lipo power is smoother across the charge and you can find very high mAH ratings in fairly small packages. Here is a review of a range of 5800 mAH 2s (7.4v) batteries. http://www.bigsquidrc.com/lipo-battery-shootout-4-2s-5800-mah-edition/

My EZ-B runs well on a very small 1600 mAH 2S battery.

A 3S Lipo produces 11.1 volts which may be too much for the EZ-B, but may work for your motors.

With the space you have you could even fit several Lipo batteries in there with no problem.

You would need a charger capable of Lipo batteries. Also you need to be careful to not discharge them completely. The EZ-B has a built in protection for this, cutting off at less than 6 volts which is good for a 2S battery. For the motor circuit there are Lipo cut-off modules available that will plug into an ESC (Electronic Speed Control) to protect against too much discharge. More expensive ESCs have these built in. I am assuming there is some sort of ESC in your tank.

On the other hand, maybe you are running the motors through the EZ-B? If so you already have low voltage protection for 2S batteries.

Well, I am not sure how helpful this is for you project. I do know it took me a while to switch from NIMH to Lipo for R/C and for me it was a smart switch.

Here:

For battery: Voltage should be at around 7V for the motors(I can smell them working hard) Needs to have a higher capacity Needs to be very small(Current batteries 5-1/2 by 10 by 1-1/2cm)

Thanks.

The goal that Technopro seeks is to determine the power (amps) that will be consumed when running the stock motors in the tank. Once the power needs are identified then the battery size, chemistry, and capacity can be determined for an easy solution.