RCCrawler Forums

shimey · 01-20-2009, 02:36 PM

So I've ruined two batts now (eflite 7.2v's from my Blade CX2) forgetting and leaving them plugged in.

Any suggestions for a stand-alone lipo voltage cutoff? I'm not to the point where i want to invest in a sidewinder micro or similar esc, but 10-15 bucks is do-able.

binaryterror · 01-20-2009, 02:40 PM

Even a cut-off plugged in can ruin a pack...it constantly checks voltage...might be small amperage but still not a fix.

You need to unplug the battery it isn't that hard to do.

shimey · 01-20-2009, 02:45 PM

Quote:

Originally Posted by binaryterror

Even a cut-off plugged in can ruin a pack...it constantly checks voltage...might be small amperage but still not a fix.

You need to unplug the battery it isn't that hard to do.

Hrrmmm. Good to know. And lolz, you're right. Summoning enough brain cells to REMEMBER to unplug it - that's the hard part.

Uniballer · 01-20-2009, 05:53 PM

I have seen small voltage alarms for around 6 bucks. They will sound an alarm when the pack gets in the 6 volt range. It was mentioned in a thread on here with in the last week. I think the thread was about what 2c Lipo people were using. Might not help if you leave the pack plugged in and are not hearing range of the car.

Rare Bear · 01-21-2009, 07:10 AM

Quote:

Originally Posted by shimey

Hrrmmm. Good to know. And lolz, you're right. Summoning enough brain cells to REMEMBER to unplug it - that's the hard part.

Give this a look; I'll be using this on my MRC, and it is not only audible, but displays different colors of light to show you the status of the battery.

http://www.helidirect.com/product_in...oducts_id=8158

buildit breakit · 01-21-2009, 08:03 AM

You can get a cheap timer at Home Depot that plugs in an outlet and has an outlet on it, this might help.

fixed13 · 01-21-2009, 08:05 AM

that looks like what was mentioned in the 2c lipo thread, $6 from that link though, maybe do some digging.

shimey · 01-21-2009, 08:19 AM

Quote:

Originally Posted by Rare Bear

Give this a look; I'll be using this on my MRC, and it is not only audible, but displays different colors of light to show you the status of the battery.

http://www.helidirect.com/product_in...oducts_id=8158

Yeah, found the other thread, and was looking at something very similar on maxamps.com. Also says "do NOT leave the unit plugged into your pack while not in use." Wonder how long it would take that little buzzer and the LED's to kill a small pack. (If forgotten and out of earshot like uniballer mentioned.)

Pdog7 · 01-21-2009, 08:41 AM

Novak makes a good one for around 20 bucks.

Uniballer · 01-21-2009, 10:17 AM

Quote:

Originally Posted by shimey

Yeah, found the other thread, and was looking at something very similar on maxamps.com. Also says "do NOT leave the unit plugged into your pack while not in use." Wonder how long it would take that little buzzer and the LED's to kill a small pack. (If forgotten and out of earshot like uniballer mentioned.)

I imagine it would take a while but it would drain it. If you have as much of a concern as you seem to have about leaving your lipo plugged in then I think you need to invest in a cut-off.

FDAapproved · 01-21-2009, 11:12 AM

This is the one i'm using on my MRC.

http://www.dimensionengineering.com/LipoShield.htm

difflocker · 01-23-2009, 09:07 AM

Do you need a Lipo cut off when using the Losi Lipo battery packs made for the MRC? I do not see any documentation referring to this. Does the stock ESC have Lipo cut off?

binaryterror · 01-23-2009, 11:02 AM

The stock ESC does NOT have a lipo cut off.

Yes using any lipo means you need either a cut-off or stop before it gets to low.

CreepyCrawl · 01-23-2009, 01:30 PM

For any Lipo battery the lowest voltage you should drop it to is 3.0 volts per cell to avoid causing any permanent damage. If you have a nice charger like a Triton 2, an ICE or something of that caliber, it is sometimes possible to bring a Lipo back from a lower voltage dump than that, however most of the time it's never the same again.

difflocker · 01-24-2009, 01:27 PM

Did some research....without dropping the cash on a new ESC, I will try the Novak Smart Stop for a 2 cell LiPo on the stock MRC ESC.

DirtyDezPirate · 01-24-2009, 04:06 PM

Dont you guys have any cell spy monitoring system?? i check with it every time i flip it while practice.. or at comps I check it every after i finish a corse.

omarsez · 01-25-2009, 12:46 AM

I ran across this ... http://www.hobbycity.com/hobbycity/s...idProduct=7390

what do you guys think>???? im going to order one.>>

Timothy Hill · 01-25-2009, 09:13 AM

Have a three cell without a balanceing plug on it have no idea of the voltage? chaged it a few times everything seems ok? Bought a new pack one cell was 2.56 and one 5.00 keep messing with it have been able to get low cell up to 3.28 but the one cell hovers around 5.00 never droping below 4.98? have heard horror stories about fires and explotions!
any suggestions? Vender said I could send it back guess this would be best, poor little truck no power for a while. would like to avode that do not like to return thing should be able to do this myself.

01-20-2009, 02:36 PM	#1
shimey Rock Stacker Join Date: Sep 2004 Posts: 73	Lipo cutoff So I've ruined two batts now (eflite 7.2v's from my Blade CX2) forgetting and leaving them plugged in. Any suggestions for a stand-alone lipo voltage cutoff? I'm not to the point where i want to invest in a sidewinder micro or similar esc, but 10-15 bucks is do-able.

01-21-2009, 08:41 AM	#9
Pdog7 TN State Champ 11,12,13 Join Date: Oct 2008 Location: KTM Talk.com Posts: 1,796	Novak Lipo Cut-off Novak makes a good one for around 20 bucks.

01-25-2009, 09:13 AM	#18
Timothy Hill Rock Stacker Join Date: Dec 2008 Location: 5170 Binder Rd Cashmere Posts: 83	3c lipos Have a three cell without a balanceing plug on it have no idea of the voltage? chaged it a few times everything seems ok? Bought a new pack one cell was 2.56 and one 5.00 keep messing with it have been able to get low cell up to 3.28 but the one cell hovers around 5.00 never droping below 4.98? have heard horror stories about fires and explotions! any suggestions? Vender said I could send it back guess this would be best, poor little truck no power for a while. would like to avode that do not like to return thing should be able to do this myself.

01-20-2009, 02:40 PM	#2
binaryterror I wanna be Dave Join Date: Jan 2004 Location: Detroit Posts: 3,583	Even a cut-off plugged in can ruin a pack...it constantly checks voltage...might be small amperage but still not a fix. You need to unplug the battery it isn't that hard to do.

01-20-2009, 05:53 PM	#4
Uniballer Rock Stacker Join Date: Oct 2008 Location: Richmond Posts: 59	I have seen small voltage alarms for around 6 bucks. They will sound an alarm when the pack gets in the 6 volt range. It was mentioned in a thread on here with in the last week. I think the thread was about what 2c Lipo people were using. Might not help if you leave the pack plugged in and are not hearing range of the car.

01-21-2009, 08:03 AM	#6
buildit breakit Newbie Join Date: Jan 2009 Location: Dallas Posts: 6	You can get a cheap timer at Home Depot that plugs in an outlet and has an outlet on it, this might help.

01-21-2009, 08:05 AM	#7
fixed13 Rock Crawler Join Date: Dec 2007 Location: St. Cloud Posts: 632	that looks like what was mentioned in the 2c lipo thread, $6 from that link though, maybe do some digging.

01-21-2009, 11:12 AM	#11
FDAapproved Pebble Pounder Join Date: Sep 2008 Location: Encinitas Posts: 134	This is the one i'm using on my MRC. http://www.dimensionengineering.com/LipoShield.htm

01-23-2009, 09:07 AM	#12
difflocker Rock Crawler Join Date: May 2007 Location: Glendora Posts: 571	Do you need a Lipo cut off when using the Losi Lipo battery packs made for the MRC? I do not see any documentation referring to this. Does the stock ESC have Lipo cut off?

01-23-2009, 11:02 AM	#13
binaryterror I wanna be Dave Join Date: Jan 2004 Location: Detroit Posts: 3,583	The stock ESC does NOT have a lipo cut off. Yes using any lipo means you need either a cut-off or stop before it gets to low.

01-23-2009, 01:30 PM	#14
CreepyCrawl I wanna be Dave Join Date: Oct 2006 Location: Centered Posts: 2,082	For any Lipo battery the lowest voltage you should drop it to is 3.0 volts per cell to avoid causing any permanent damage. If you have a nice charger like a Triton 2, an ICE or something of that caliber, it is sometimes possible to bring a Lipo back from a lower voltage dump than that, however most of the time it's never the same again.

01-24-2009, 01:27 PM	#15
difflocker Rock Crawler Join Date: May 2007 Location: Glendora Posts: 571	Did some research....without dropping the cash on a new ESC, I will try the Novak Smart Stop for a 2 cell LiPo on the stock MRC ESC.

01-24-2009, 04:06 PM	#16
DirtyDezPirate Quarry Creeper Join Date: Dec 2008 Location: Ramona Posts: 233	Dont you guys have any cell spy monitoring system?? i check with it every time i flip it while practice.. or at comps I check it every after i finish a corse.

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01-25-2009, 12:46 AM	#17
omarsez Newbie Join Date: Dec 2007 Location: St.George, UT Posts: 30	I ran across this ... http://www.hobbycity.com/hobbycity/s...idProduct=7390 what do you guys think>???? im going to order one.>>

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