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Get the details on some fellow R/C enthusiast common questions and some of ORCCTM's How-To
along with ORCCTM's answers to your questions listed bellow on our blog post's

Monday, November 1, 2010

Double Up

Kevin wrote to Online Radio Control Car & Truck Mechanic:

"I want to put two battery packs in my truck to make it go faster. How do I go about wiring it properly. My friend Aaron says it will only make my runtime longer But I wanted it to go faster. What does he mean two batteries will make me have longer run time??
I want to go FASSSST. Wiring HELP!!
-Kevin Ont,Can."

Straight to the point, OK I can deal with that. Kevin... you can actually put two battery packs in your truck one of two ways. Series, and Parallel. Let me show you.
First you should check if your vehicle can even hold two battery packs. Some vehicles are designed with dual batteries in mind, such as an HPI E-Savage or Traxxas' E-Maxx. Other vehicles may be designed around one battery pack, but you can easily find room for a pair of battery packs in a lot of other cars. Since you didn't enclosed what R/C you are running I can't give you more specific info on how to do this (for YOUR truck) but you can use your imagination on where one extra battery would fit in your car. Maybe piggy back onto the other? or on each side of the chassis.
Before you do ANYTHING! Check the Specs for the ESC you are using!!! You'll need to find the manufacturer documentation stating the maximum input voltage that it can handle. For two 7.2v 6-cell packs, you'll need an ESC rated at least 14.4 volts. (wired in series) For two 7.2v 6-cell packs (in Parallel), you'll need at least an input of 7.2V volts. but most sport ESC will have a max of 8.4v. If you run LIPO batteries, I would NOT ADVISE you to run more than one lipo in your car. One lipo is often better and more capable then two NIMH dry cell battery packs no matter the configuration. These methods are typically for non-lipo batteries. Besides, one draw back to these methods are twice the weight in your car. The lipo's are lighter and can offer you simular performance. If you can't afford new lipo's and a charger for yourself, this is always the cheap way to speed and run-time on a budget. But effective. Let's take a look at a diagram to see what all this is talk is about.


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* Note: you may have to make a wiring harness to accommodate these type of battery configurations. If you make one of each you always have something on hand to bash around with.
Finally I need to tell you about one more bit of information. Not only does an extra battery make the car heaver and may not always increase performance, but in the "series" setup your run-time will go down faster than the single battery, and the parallel setup will give you a longer run-time than just the one battery. It's the give and take mentality. Hope this helps.

PS. Let me know what car/truck you want to do this in, and I'll be glad to give you some pointers.

-ORCCTM Tech.

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