lipo problems, terrible runtimes - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-16-2008, 01:00 AM   #1
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lipo problems, terrible runtimes

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The battery i'm using is a brand new 5000mah maxamps 3S Lipo battery. I have charged it about 3 times since it's purchase.. The runtimes I have got from it so far are terrible.. first time it lasted about 15 mins tops, second time about the same and the 3rd time I got about 2 mins runtime from it before the low voltage cutoff kicked in. It's being used in a traxxas rustler vxl. I'm currently using a Venom Balance/Charger which seems to work good. It charges slow at 1.5amps maximum so it does not heat the battery up at all. This lipo has not got warm at all from running or charging, it stays around room temperature. The charger balances each cell while charging so the pack is being charged properly..

Do these lipo batteries need to be cycled a few times before they start to work properly? The last time i ran it was today and like i said runtime was 2 mins before the LVC came on. I had charged the pack yesterday so it sat which shouldn't hurt it. I did charge the battery outside where it was fairly cool, could that cause it to fall off that much? I read that lipos like some heat but you wouldn't think they would fall off that much? I should be getting at least 15 solid minutes of runtime with a 5000mah pack with a stock rustler vxl.

Any ideas? tips? The battery is brand new, no puffing, nothing...

It's kind of frustrating when I think I paid $250 for a battery that doesn't run any longer than my 4500 nimh packs

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Old 04-16-2008, 06:01 AM   #2
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re charging lipos

you should definately be getting longer run times with your max amps battery.

i also have both 2s lipos and 3s lipos made by maxx amps and a goodrule of thumb when charging is to charge 1 amp per 1000mih of battery.

you have a 5000 mih lipo so you should be charging it at 5 amps rate.

most good chargers will allow you to charge your lipo at 5 amps. ( i have a duratrax ice charger which can charge up to 8 amps rate for lipos.)

balancing your lipos from time to time will help to keep it charging at full capacity.
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Old 04-16-2008, 08:39 AM   #3
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I agree

Must be something to do with the low charge rate.
if the batt is at low voltage cutoff at 1.5 amps it should take about 4 hours to charge or more.
If you know someone with a charger that will do lipo @ 5A have them chg for you and see.
it should go a lot longer.
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Old 04-16-2008, 09:30 AM   #4
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what r u charging with ?
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Old 04-16-2008, 11:14 AM   #5
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Hey guys, this is what I found out today.. There is nothing wrong with the battery or charger.. I was ripping around with the truck doing some high speed passes when after 15 mins or so the LVC kicked in so the truck went into trainer mode.. I shut off the ESC and powered it back on and sure enough the green light came back on, the LVC wasn't on.. I drove it again for another 15 mins with full power so I just ended up shutting the truck off to cool it.. SO basically i got 1/2 hour runtime and there was still some left.. It's the ESC kicking into LVC mode.. It doesn't do it during high speed passes.. it kicks in after stopping sometimes.. weird? ever hear of this?
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Old 04-16-2008, 12:45 PM   #6
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charging at lower amps won't hurt anything, it just takes longer.

ay high speed passes the esc is working properly and allowing the current to go to the motor. heat comes from low to mid throttle input where the extra current is heat. the esc doesn't seem to like the lipo voltage maybe? does it do this with the nmh pack?
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Old 04-16-2008, 01:26 PM   #7
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What voltage do you have the LVC set for ..?...
2.8Volts or 3.0+ Volts?...
The Power of BRUSHLESS!!!!!
1HP (electric) = 746 Watts.
Everything is brushless!!
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Old 04-16-2008, 02:46 PM   #8
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well it doesn't do this at all with the NimH packs because i disable the LVC with NiMh packs.. As for setting the LVC voltage setting with the Vxl, i'm not sure you can, I think it's built in.. unless i'm wrong..

It runs great, real fast haha actually too fast on 3S power but it's just weird how it kicks in the LVC once in awhile. It might be the high voltage of the battery like pipeous mentioned...

For now i'll just reset the esc every 15 mins or so, i don't like running too long without a cooldown period anyways.. I'll know when the battery really is going into LVC mode because resetting it shouldn't matter at that point, once the voltage gets too low it should power back up in LVC mode..
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Old 04-16-2008, 11:38 PM   #9
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Low Voltage Cut-Off

I have the Rustler VXL as well. You cannot set the LVC on the ESC, it's just either on (green light), or off (red light). Right now I am using a 2 cell Li-Po, the Peak Racing 4800 mah. I think the ESC's LVC is set for a 3-cell Li-Po only, so it always kicked in after running for less than 5 minutes. So now I am running my Li-Po with the LVC turned off. I know it's the Number 1 no-no when running Li-Po's, but I am very very careful. The slightest noticable drop in speed and frequency of wheelies , I stop the truck and check the voltage of the battery with my handy voltmeter. So far my Li-Po is still alive (10 runs or so). Runtimes are around the 20-minute mark.
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Old 04-25-2008, 09:42 AM   #10
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Guys the VXL esc's are notorious for false triggering the LVC. It seems to be more of a problem with higher capacity and voltage packs. I have had a lot of guys dump the stock LVC and switch to a Novak unit a then there is no more problems. Or you can switch to a Mamba Max esc and get more tuning capabilities.

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