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Old 07-02-2009, 08:06 PM   #1
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Default The Big Monster Trucks have two batteries... with LiPos, no need?

The big electric monster trucks (Emaxx, Savage, etc) have dual battery compartments, because their single or twin motors can take 14.4v or even more...

With the advent of 3S, 4S (and more) LiPo batteries, isn't there a design in the works that will use only one battery?

The problem with 2 battery models is the need for taking care of dual batteries all the time... "gotta get two similar packs at once" or "gotta charge/discharge/cycle two packs at once" etc...

Wouldn't it be more convenient to just have one big pack (say, 4S, 5S, 6S, etc) in the truck instead? They have high mAh's anyway...

Basically, that's what I'm after... normally, monster trucks are for bashing (yes, they can be raced, but their design is more for bashing... the e-Revos, for instance, are more race oriented than e-Maxxes in their original form). So, bashers want convenience, right...

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Old 07-02-2009, 08:42 PM   #2
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Sure, but the Flux wouldn't nearly be as fun on 1 Lipo vs 2 and that would suck. Wouldn't be any better then a Traxxas Stampede, so whats the fun in that?

If you want convienence and lower cost, you spend less on a lower end Monster truck that runs on one battery.

If you want major speed/power and cool factor, you get the big bad boys with dual motors/dual batteries. Dual batteries extend run times and give you more power, for a price, if your willing to shell out for it

That just how it works. Gotta pay to play with the big boys

And honestly, is it REALLY that hard to take care of one extra battery? No, I think not. If your really that impatient, go buy a second or dual charger.
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Old 07-02-2009, 09:04 PM   #3
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Of course I want the speed and punch...

Twp 2S Lipos are 14.4v, whereas a single 4S lipo is also 14.4v, correct? I mean, instead of two 3S lipos, why not just one 6S lipo?

I do have a dual charger now (Hyperion 615 Duo3)... on my original E-Zilla (henceforth e-Savage), I can charge two batteries, and that's good for a single run. If it were a one battery deal, then that would be good for two runs...

(kinda like what people do to their monster trucks... two motors is better than one, but one feigao is better than two stock motors, for instance -- and that's what some people have done, right?)
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Old 07-02-2009, 10:11 PM   #4
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Quote:
Originally Posted by Alfalfameister View Post
Of course I want the speed and punch...

Twp 2S Lipos are 14.4v, whereas a single 4S lipo is also 14.4v, correct? I mean, instead of two 3S lipos, why not just one 6S lipo?

I do have a dual charger now (Hyperion 615 Duo3)... on my original E-Zilla (henceforth e-Savage), I can charge two batteries, and that's good for a single run. If it were a one battery deal, then that would be good for two runs...

(kinda like what people do to their monster trucks... two motors is better than one, but one feigao is better than two stock motors, for instance -- and that's what some people have done, right?)
I dunno man, take it up with the manufacturers if your that desperate for changes.
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Old 07-03-2009, 02:03 AM   #5
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It's for weight distribution

You have a driveline down the middle, so you can't mount one big 4s or 6s battery on one side, so you mount a 2s or 3s either side of the transmission.
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Old 07-03-2009, 03:24 AM   #6
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I did think of that... (weight distribution and all)...

Heck, I'd really rather have two packs than (ugh!) a saddle pack (apologies to saddle pack lovers).

But a designer could, in theory, make a design where the battery can be in the middle... dunno how feasible that is. I'm not the designer after all. I'll let them engineer the details.

And, Freezebyte, dunno where you get the idea that I'm "desperate"... I'm in the hobby for the same reasons as you are: to have fun, perhaps to tinker, and just to relieve some stress. I'm just putting forth an IDEA, which, of course, you are free to disagree with. But, just like you, I want power, speed, bashability, and a whole lot of fun! I think, in that, we agree... we just disagree about the one or two battery thing.

That said, my two-battery Flux will be coming in soon.
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Old 07-03-2009, 07:09 AM   #7
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Once you get your Flux, I think you'll see what the designers are coping with. The drive train pretty much has to be in the middle. I have a CRT.5 that the drive train is slightly offset to the side to make it better balance with a single lipo, but if I run a big capacity lipo like an 8000mah, I can see effects of the off balance caused by the that weight. Its not enough to add spring preload to the heavy side and get ride height better balanced, as soon as it leaves the ground, you can see the the imbalance.

Dual batts allow you to balance both side to side and front to rear. Afraid the dual batts right now is the best solution until something better comes along.
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Old 07-03-2009, 09:10 AM   #8
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I have a couple of trucks that can use one pack, but I wish it were in the middle like post says. My e-maxx has one motor in one battery tray and the single pack in the other battery tray, it is balanced nicely. The weight is too far to the outside though and could be improved quite a bit by moving towards center.

My other is the e-savage which allows a single pack to be used right thru the center rear of the chassis (cross-wise). This is a nice set-up, but is limited in battery size.

The e-maxx isn't a bad design to use a single pack cross-wise. It is quite high though. Many times a pair of packs is more versatile, and stil can be stacked up as a single pack.

An E-truggy may be what you want too.
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Old 07-04-2009, 08:50 AM   #9
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Quote:
Originally Posted by Alfalfameister View Post
I did think of that... (weight distribution and all)...

Heck, I'd really rather have two packs than (ugh!) a saddle pack (apologies to saddle pack lovers).

But a designer could, in theory, make a design where the battery can be in the middle... dunno how feasible that is. I'm not the designer after all. I'll let them engineer the details.

And, Freezebyte, dunno where you get the idea that I'm "desperate"... I'm in the hobby for the same reasons as you are: to have fun, perhaps to tinker, and just to relieve some stress. I'm just putting forth an IDEA, which, of course, you are free to disagree with. But, just like you, I want power, speed, bashability, and a whole lot of fun! I think, in that, we agree... we just disagree about the one or two battery thing.

That said, my two-battery Flux will be coming in soon.
FLM makes such a chassis and it moves the tranny forward which in turn helps the balence of the truck and weight transfer. Also is extended.. Id never buy a Flux RTR build it FTW! It was made as a conversion for the Nitro savage way back but I still think its a superior design to HPI's... Brushless Conversion FLM49000

MoparRules built one here: BL savage conversion
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