RCCrawler Forums

fatwoul · 09-29-2008, 05:09 PM

I posted this in Newbie because it seemed like something that may have been discussed, but I couldn't find it. If this better belongs in Electronics, then my apologies.

Whilst looking for information about waterproofing ESCs, I have read around a couple of RC boat sites. A few of them use multiple 7.2 packs in parallel, the idea being that they want 7.2 to last much longer. Obviously they want plenty of run time, and don't want to have to wade into lakes to fetch their dead models.

Has anybody ever tried this with crawlers? I can get well over an hour of driving from my 4500 7.2 pack, and I am getting a second one tomorrow. The plan was to use it as a spare, so that if I get carried away on long hikes, I won't have to carry the truck home. But I've read you can get 70-80% additional run time by running both packs at the same time. Not the 100% you'd get running them seperately, but I expect that's because the vehicle has to carry both batteries the whole time.

rainman · 09-29-2008, 05:19 PM

I think that would be to heavy for a rock crawler unless you were running a123 batteries. thats what I've seen anyways

XPLORx4 · 09-29-2008, 07:54 PM

For a comp crawler, I don't see any advantage of running 2 6-cell sub-C stick packs in parallel. The weight distribution and COG issues would be counterproductive to crawling, and it's not that hard to swap batteries. Just stick that extra battery in your back pocket if you don't want to carry the rig while you're out hiking.

For a scale rig, it might be useful, though, especially if the model has been built so that the body isn't convenient to remove, and you want loads of runtime.

701 Technique · 09-29-2008, 10:17 PM

Sounds like a cool idea to me, I would just makes sure to keep the weight as low as possible. Maybe mount the second pack to the top of the second axle

bigflex · 09-30-2008, 11:54 PM

the only way I would concider it is if you were running 1500mah 2/3a packs. Then you could have a mini T style pack on top of your front upper links and a split pack on the front axle. Otherwise like stated already it would be very heavy and hinder more than help.

sloppy · 10-01-2008, 10:21 AM

I have seen it done. it is allot of weight like others have mentioned.. but on a pure trail truck it may not matter.. what I always did was just carry the other pack in my pocket and then changed on the long runs..

09-29-2008, 05:09 PM	#1
fatwoul Quarry Creeper Join Date: Aug 2008 Location: UK Posts: 243	Running NIMH 7.2s in Parallel... I posted this in Newbie because it seemed like something that may have been discussed, but I couldn't find it. If this better belongs in Electronics, then my apologies. Whilst looking for information about waterproofing ESCs, I have read around a couple of RC boat sites. A few of them use multiple 7.2 packs in parallel, the idea being that they want 7.2 to last much longer. Obviously they want plenty of run time, and don't want to have to wade into lakes to fetch their dead models. Has anybody ever tried this with crawlers? I can get well over an hour of driving from my 4500 7.2 pack, and I am getting a second one tomorrow. The plan was to use it as a spare, so that if I get carried away on long hikes, I won't have to carry the truck home. But I've read you can get 70-80% additional run time by running both packs at the same time. Not the 100% you'd get running them seperately, but I expect that's because the vehicle has to carry both batteries the whole time.

09-29-2008, 05:19 PM	#2
rainman Newbie Join Date: Sep 2008 Location: G-ville Posts: 18	running in parallel I think that would be to heavy for a rock crawler unless you were running a123 batteries. thats what I've seen anyways

09-29-2008, 07:54 PM	#3
XPLORx4 Quarry Creeper Join Date: Jul 2008 Location: Galt Posts: 282	For a comp crawler, I don't see any advantage of running 2 6-cell sub-C stick packs in parallel. The weight distribution and COG issues would be counterproductive to crawling, and it's not that hard to swap batteries. Just stick that extra battery in your back pocket if you don't want to carry the rig while you're out hiking. For a scale rig, it might be useful, though, especially if the model has been built so that the body isn't convenient to remove, and you want loads of runtime.

09-29-2008, 10:17 PM	#4
701 Technique RCC Addict Join Date: Sep 2007 Location: Western ND, Bakken central Posts: 1,653	Sounds like a cool idea to me, I would just makes sure to keep the weight as low as possible. Maybe mount the second pack to the top of the second axle

09-30-2008, 11:54 PM	#5
bigflex I wanna be Dave Join Date: Jun 2005 Location: drillin Holes for the man Posts: 2,736	the only way I would concider it is if you were running 1500mah 2/3a packs. Then you could have a mini T style pack on top of your front upper links and a split pack on the front axle. Otherwise like stated already it would be very heavy and hinder more than help.

10-01-2008, 10:21 AM	#6
sloppy I wanna be Dave Join Date: May 2006 Location: akron Posts: 4,054	I have seen it done. it is allot of weight like others have mentioned.. but on a pure trail truck it may not matter.. what I always did was just carry the other pack in my pocket and then changed on the long runs..

Sponsored Links

RCCrawler Forums

Thread: Running NIMH 7.2s in Parallel...