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Old 10-12-2017, 08:45 PM   #1
barnbred
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Default PK01V battery corroded inside...

I pulled the red dot out of storage and it didn't work. Went to change batteries and the battery on the negative end corroded and there is heavy corrosion in the negative connection. The new batteries will not power it up to where the red dot is bright enough to use but it is powering it up. Im hoping i can salvage this by cleaning the corroded end.

What is the best way to clean it and not damage it? Someone recommended dipping a cotton swab in vinegar. Another said gently clean area with a pencil eraser.
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Old 10-12-2017, 10:00 PM   #2
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Is it just "corroded" or did the battery leak?
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Old 10-12-2017, 10:05 PM   #3
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Vinegar is popularly recommended because it is usually in the house. But I have a feeling that any weak acid will work to remove that white corrosion. The phosphoric acid in a coke a cola works on car batteries. Take your time, go slow.

Protip - always replace batteries with new ones from the same package. Presumably, because they were produced at the same time they should be equal. You want the batteries to be equal. If one battery is stronger than the other it will try to recharge the other battery in the circuit to equalize out between the two. It’s the recharging of the weak battery that causes the leakage of the electrolyte and corrosion on the terminals of the device.
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Old 10-12-2017, 10:19 PM   #4
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Is it just "corroded" or did the battery leak?
I honestly don't know what the difference would look like but I could not open the battery cap without using a pliers and it was not easy. The corrosion inside sealed it up tight. Didn't see any obvious signs like the battery had burst or had any holes.
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Old 10-12-2017, 10:36 PM   #5
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Tough to tell without seeing it. WD 40 might do the trick without mucking up the circuitry.
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Old 10-13-2017, 09:32 AM   #6
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Pencil eraser should work for the coil to battery connection end, but if corrosion is left inside anywhere it will propagate again. Leaking batteries don't always give off liquid, but compromised cases can give off gases. If you can get to the connector with a brush either nylon or brass bristle would be good. Then blow all of the crap out with a can of compressed air. I would recommend against using anything liquid.
In the future I would recommend getting the Energizer lithiums (no leak guarantee), same thing I use in my EoTech. Energizer's guarantee will replace your items if those batteries ever leak or screw up your device. You can also coat the battery ends with a thin coat of bulb grease (available at most automotive stores) upon initial install. The grease is intended to suspend particles and enhance connection for extended periods of time and in extreme environments.
Hope this helps.
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Old 10-13-2017, 10:54 AM   #7
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Use No-Ox on ALL batteries.
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Old 10-13-2017, 11:02 AM   #8
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Use No-Ox on ALL batteries.
That works too. Thing is........a lot of folks don't know the difference between a thin (thin) film (film) and a glob.
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