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HelicopterMain Discussion › 12v Batt charger
06-04-2004 04:22 AM  13 years agoPost 1
CH-47FE

rrNovice

Fayetteville, North Carolina

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The other day I went to fly after charging my fieldbox battery(12volt), and I did not have enough juice to turn the starter, I checked the battery with a multimeter, only to find it was at 10.6 volts. My question is, I connect the charger to the wall outlet, and checked the voltage with a multimeter, how much should it be, cause it was only .2vdc. I dont think that is right. Help me out here please.

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06-04-2004 04:56 AM  13 years agoPost 2
excellone

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Arlington, Virginia

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Your battery and wall charger seem to be gone. Sealed lead acid batteries need .5-1 A to charge to battery to 14.4 V. With no load, my charger reads 14.38 V. Here is a link for a good automatic battery charger that work very well for the field box. I have been using it since last year with good results.

http://www.batterymart.com/battery.mv?p=ACC-12BC1000D-1

George

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06-04-2004 05:00 AM  13 years agoPost 3
CH-47FE

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Fayetteville, North Carolina

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You think the battery is bad too

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06-04-2004 06:17 AM  13 years agoPost 4
Fullagas

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Michigan

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.
Might be a bad cell.
If it's a lead-acid, check it with a cheap hygrometer from the auto supply store. They usually have them for a couple dollars. I've had a field-box battery seem bad, but charged it and lasted another 2 years.

Worth a try.


.

Flying helis since gyros had springs.

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06-04-2004 09:46 AM  13 years agoPost 5
Drunk Monk

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Preston, UK

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The battery might be ok, if your charger is goosed and you didn't realise it, thinking you were charging and it but you wasn't then the voltage would drop. Best thing is if you have a car battery charger, use that. I do, just make sure you DON'T quick charge the battery. Give it a nice slow charge. Most people have a car battery charger lying around.


Stephen

I only open my mouth to change feet.....

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06-04-2004 03:32 PM  13 years agoPost 6
d_wheel

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Deep in the heart of Texas.

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When you get your battery problem straightened out, you might want to think about getting a good charger for it. I have been using an Accumate for over 2 years and am thoroughly satisfied with it. When arriving home from a flying session, I just connect the battery to the Accumate and forget about it until the next time out. Operation is fully automatic and will keep the battery at full charge. You can check it out at:

http://www.westcobattery.com/chargers.html

Later;

D.W.

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06-04-2004 04:47 PM  13 years agoPost 7
Hughes500Pilot

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Anaheim, CA

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I've been using a Battery Tender Jr. for a while now. Just plug it in and your done. You can leave it on for a day or a year. -Steve


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06-04-2004 05:21 PM  13 years agoPost 8
S_Owen

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Wichita Falls, TX.

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The car battery charger I have is selectable 4/8 Amps. I tried using it once on the 4 amp setting. My rectangular gel-cell became round. That's right, a round ball of a battery. Oops.

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-05-2004 02:15 AM  13 years agoPost 9
Gary Jenkins

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Nowhere, US

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I've been using a Battery Tender for years now. Just plug it in and walk away. You can leave it on for a day, week , month or year.

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06-05-2004 04:42 AM  13 years agoPost 10
Fullagas

rrKey Veteran

Michigan

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.
Just plug it in and walk away. You can leave it on for a day, week , month or year
Quite sinister, how their ad copy keeps popping up, over and over.


...And over...


.

Flying helis since gyros had springs.

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06-05-2004 06:33 AM  13 years agoPost 11
CH-47FE

rrNovice

Fayetteville, North Carolina

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Thanks alot guys, think I'll buy a new charger and see what happens . Thanks again. Holla!!!

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06-05-2004 12:47 PM  13 years agoPost 12
Drunk Monk

rrProfessor

Preston, UK

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The car battery charger I have is selectable 4/8 Amps
Oh dear, your just found out the hardway that 4A is way to much, you should be looking at about 500mA


Stephen

I only open my mouth to change feet.....

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06-05-2004 06:28 PM  13 years agoPost 13
S_Owen

rrApprentice

Wichita Falls, TX.

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Well that was about 13 years ago. Before that, I was using a lawn tractor battery for a number of years. It worked fine on the car charger. The gel-cell, well, it didn't. Who knew!?

[b]Murphy's Constant:[/b] Matter will be damaged in direct proportion to its value.

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06-07-2004 11:23 AM  13 years agoPost 14
donlynn

rrKey Veteran

New Zealand

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Gidday

When charging lead acids constant voltage seems to be successfull, the battery tends to draw what it requires.

~14v dc seems to work well.

This is not counting muliti stage / boost float charging regimes.

A good thing to do to confirm your system is a voltmeter on the battery toward the end of charge and check it is not too high, like greater than ~14.5

Violent gassing or any warmth is indication that a charged state has been achieved, more charging at a uncontrolled voltage will do damage.

Regards Don

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HelicopterMain Discussion › 12v Batt charger
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