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Author Topic: Neutralizing battery corrosion  (Read 9239 times)

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Offline Amiga4kTopic starter

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Neutralizing battery corrosion
« on: October 20, 2008, 05:19:14 PM »
The best way to neutralize the battery leak

(1) Remove the board
(2) Clean by either method with toothbrush, brushing in the direction of traces, NOT across them
(a) Spraying with vinegar
(b) using a 3 part Baking Soda and 1 part distilled paste
(3) use different toothbrush to rinse and brush with distilled water
(4) Use litmus paper to test for alkalinity. When the red paper remains red, the solution has been neutralized

Link to placing battery off motherboard
http://www.amiga.org/forums/showthread.php?t=32350

Link to Varta Nimh battery
http://www.amiga.org/forums/showthread.php?t=32694
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Offline tone007

Re: Neutralizing battery corrosion
« Reply #1 on: October 20, 2008, 07:15:15 PM »
I'll stick with my method of licking the board.
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Offline dannyp1

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Re: Neutralizing battery corrosion
« Reply #2 on: October 24, 2008, 01:02:24 AM »
I might be missing something here but how is spraying acid on an acid neutralizing it?  I can buy the baking soda method but I would probably mix a solution rather than a paste.
When you are cleaning the acid off your car battery terminals do you use vinegar or baking soda?  The vinegar will do nothing.  The baking soda will neutralize it.

Dan
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Offline rkauer

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Re: Neutralizing battery corrosion
« Reply #3 on: October 24, 2008, 01:09:04 AM »
Quote

dannyp1 wrote:
I might be missing something here but how is spraying acid on an acid neutralizing it?  I can buy the baking soda method but I would probably mix a solution rather than a paste.
When you are cleaning the acid off your car battery terminals do you use vinegar or baking soda?  The vinegar will do nothing.  The baking soda will neutralize it.

Dan


 The leakage is a hydroxide, so any soft acid will neutralize it.

 Personally I prefer lemon juice, myself.

 With the leftover I can make a "margherita" or a "caipirinha". :-D
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Offline sbeehre

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Re: Neutralizing battery corrosion
« Reply #4 on: October 24, 2008, 02:17:39 AM »
i cleaned mine with isopropyl alcohol but after reading this i still might have some work to do...
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Offline Amiga4kTopic starter

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Re: Neutralizing battery corrosion
« Reply #5 on: October 26, 2008, 10:35:48 PM »
Vinegar can be used --- read and be more informed. It neutralizes Nimh battery leakage. All Varta's are Nimh, not NiCad.

http://en.wikipedia.org/wiki/Vinegar
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Offline Jambalah

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Re: Neutralizing battery corrosion
« Reply #6 on: October 26, 2008, 11:30:00 PM »
On my Amiga 4000 I used a cleaning spray for electric circuit (declared to remove oxide) and a toothbrush.
Then I used a mix of vinegar and water (most vinegar) and the toothbrush again. I repeated this steps for 4 or 5 times (it's a delicate work...) and that's the result:
A4000cleaning
All the mobo around the battery was covered by oxide (up to the U187) and even on the left (up to the corner of mobo). Traces of leaking on the other side of the mobo, too.
Unfortunately, one or two traces seem to be corroded  :-(  and this could be what causes Amiga 4000 not to work anymore (I should check under the ram sockets too...).
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Offline rustednail

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Re: Neutralizing battery corrosion
« Reply #7 on: January 11, 2009, 07:17:38 PM »
Would this technique also work for cleaning pet urine?  A few cats got into my storage unit and used a few boxes, one of which had my A500 in it.  It looks like the liquid went through the vents on the top of the cover  :madashell:
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Offline Tumbleweed

Re: Neutralizing battery corrosion
« Reply #8 on: January 11, 2009, 08:04:10 PM »
Using vinegar does this work on leaking capacitors?

I removed the battery in my A4000D and cleand the board with a specialist cleaner I got from a local electronics shop (Maplin).

The capacitors for the audio circuit have also leaked (very crackly audio) should I use the vinegar mix on the audio circuit?
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Offline orange

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Re: Neutralizing battery corrosion
« Reply #9 on: January 11, 2009, 08:10:44 PM »
even if "all Vartas are nimh", most Amigas I have seen have NiCd in them factory_put/original/default..
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Offline chiark

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Re: Neutralizing battery corrosion
« Reply #10 on: January 12, 2009, 06:10:21 PM »
Depends on what the electrolyte is...  I believe it's common for it to be slightly acidic so would be neutralised with baking soda.

or a leaking varta battery, apparently ;-)
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Offline Sandgunner

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Re: Neutralizing battery corrosion
« Reply #11 on: April 15, 2009, 06:47:42 AM »
Anyone reading this ignore Amiga4k's old 2008 post here.
All Varta's are NOT NiMh OR NiCad.

VARTA is the brand and they make every darn combination of cell battery you can think of.
Their largest line are the so called "barrel" batteries like those found in Amigas and older PCs.  These are just several coin cell batteries sealed together with a plastic shell.

Sandgunner
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Offline terminator4

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Re: Neutralizing battery corrosion
« Reply #12 on: April 15, 2009, 12:32:34 PM »
Either way, doing a Lithium hack is what every amiga user should be doing.
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Offline orange

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Re: Neutralizing battery corrosion
« Reply #13 on: April 15, 2009, 01:04:31 PM »
@terminator4

I did that on my Amigas.
but if price is not important, it may be better to use those 'supercaps', they don't need a diode, and should last much longer?
dunno if high 'inrush' current is problem with them, or if they have some drawbacks.  

I think someone here is using them.
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Offline Xamiche

Re: Neutralizing battery corrosion
« Reply #14 on: April 15, 2009, 02:13:59 PM »
@dannyp1

Actually, the substance which leaks out of these batteries is not an acid. It's a base.
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