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Old Apr 01, 2010, 08:08 PM
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United States, CA, Marin County
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FatShark goggles question...

I apologize in advance for inundating the board with questions. I'm trying to get my setup ready for in the morning and everything seems to be out of place.

I cannot find the charger for my FatShark RCV goggles. The battery is 2s appx. 800mah. Does anyone forsee a problem with me soldering the FatShark pin connector onto another 7.4v 800mah battery for which I have a charger?

-TL
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Old Apr 01, 2010, 08:13 PM
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Just get the polarity right.

I think it would work though- don't see why not.
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Old Apr 01, 2010, 08:14 PM
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You make a good point...how do I check the polarity? Both wires are black.
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Old Apr 01, 2010, 09:14 PM
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Pretty sure it's center pin positive.
And yes you can use any 2S lipo. I've got three 1000mAh 2S lipos that I use
to power my FS goggles. They're bigger than stock battery but will
still fit in the headband. They last much longer.

ian
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Old Apr 01, 2010, 09:21 PM
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Perth, Western Australia
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Assuming you have a multimeter just check for continuity between the centre pin and one of the wires to find the positive.
I only get about 600mah out of the FS batt so using a bigger one is a good idea anyway.
If you have some clips for your charger output you can also charge the stock batt with those
and a pin for the hole ( I use a prop finger balancer because mine came with US charger)
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Old Apr 01, 2010, 09:40 PM
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United States, IA, Mason City
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Its center pen positive on mine. You don't need to cut the old connector off if you don't want to, its a standard connector sold in every hobby shop (2.1mm DC plug, maybe called a "TX connector"). Can use any 2S battery you want. Finally, you don't need to throw the fatshark battery away either, charge it using any unbalanced charger; the Cellpro Multi4 even has an adapter that will allow you to charge it without making a special plug.

http://www.fmadirect.com/Detail.htm?...319&section=45
(The 2.5mm and 2.1mm plugs are on either side, you can see the labels in the picture)
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Old Apr 01, 2010, 10:22 PM
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Unfortunately, I don't live anywhere near a hobby shop and I'd like to fly tomorrow as it may be my last chance for a few days. Upon taking a closer look at the FS battery, the cord has a black wire with white stripes on it and a black wire with only a small bit of writing on it. Would it be safe to assume that the one with white stripes on it is positive?

-TL
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Old Apr 01, 2010, 11:58 PM
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No, would not be safe. Use a multimeter to see which is which.
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Old Apr 02, 2010, 12:23 AM
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Didn't have a multimeter, but I liked the circuit idea, so I did a redneck version of that. It worked. Thanks for the advice.

-TL
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Old Apr 02, 2010, 02:45 AM
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If you're going to do FPV for more than one flight, you need to buy a multimeter.
It will save you hundreds of hours of frustration and potentially thousands of
dollars worth of gear.

ian
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