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Home✈️Aircraft🚁Helicoptere-Electric General Discussion › OK to leave field battery on charger when in use?
10-30-2006 01:33 AM  12 years ago
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Two Left Thumbs

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OK to leave field battery on charger when in use?
I have a 12v 18Ah SLA battery in a portable power pack. I bring it to the field to power my chargers, but occasionally I'll use it at home as well. It has a wall wart charger which is connected all the time, it only kicks in when the battery needs it. So, to the question:

Is it OK to leave the wall wart charger connected when I am running my chargers off the battery? I don't want to fry the wall wart, and am not really sure of the way the current flows in this situation.
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10-30-2006 03:06 AM  12 years ago
Boidman (RIP)

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The ideal wall wart style charger/maintainer is usually a "float charger" (readily Googleable). Most often there are 2 or 3 indicator lights, one of which shows when the 'float' state has been reached. It sounds like you might have this type.

For your purposes, I believe you can consider the battery as a buffer that prevents most or possibly all significantly risky interactions between the household power and your RC charger. I often go mobile with a laptop, printer, and RC battery charger, all powered with an SLA (or 2). Many times it is optimum and convenient to plug the float charger in while the other equipment is running. I have been doing this for years with no major concerns or problems. Of course, I is jest an kanuklehed hoo aint no nun betr.
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10-30-2006 03:19 AM  12 years ago
Two Left Thumbs

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Thanks Boidman. The charger is just a wall wart, but the unit has a charge indicator and a battery level check button with 4 lights.

When the SLA battery is charged, the charge indicator, er, indicates If the SLA is fully charged, and indicated as such, when I hook up an R/C charger and charge a flight pack, the indicator shows it begins charging after a minute or so. I am concerned that I might be drawing too much current from the wall wart and burn it up.

I searched around and found related posts, and it seems to be that it is OK to leave the wall wart charger connected during use.

I'm curious about your mobile setup. Are you an event photographer, shooting and printing on site?
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10-30-2006 05:13 AM  12 years ago
Boidman (RIP)

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The chargers I use are wall warts too, a 900mA and 400mA. Either one gets used on 18Ah and 28Ah batteries. At times the toys are pulling around 200 watts from the SLA while on the charger with no problems.

I just take and manipulate images for sh!ts and grins. The printer is only a 4" X 6"er, to give rapid gratification for the 'posers.' Most of the horseplay is done on jobsites, but occasionally at flying fields too. My thang is the multiple exposure that digital cameras and image editing makes mostly easy these days. For helis, the standard is to have a guy move to 3-5 positions around an imaginary 15' to 20' circle, transmitter in hand, facing in, where one of the shots includes the helicopter hovering 3 to 10 feet above the center position. The combined results can be pretty damn funny if the guy is animated and good at facial expressions on demand. So der youse ave it.
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