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General Discussions => Tech Talk => Topic started by: Friendly Angel on March 13, 2017, 03:08:52 PM

Title: Electronics and Batteries
Post by: Friendly Angel on March 13, 2017, 03:08:52 PM
(http://i.imgur.com/X8LYa6v.png)

I have an action cam that uses batteries like this - the battery slides into the camera and the little terminal squares contact some springs inside the camera.

I have six of these batteries.  Frequently I can't get the camera to turn on and I think it's because of poor contact at these terminals - sometimes it helps when I lick the battery first and some batteries work better than others. 

I've seen some kinds of paste and gel that are supposed to be for conductivity but I'm not sure what to look for.

I've tried cleaning off the camera and the battery contacts.

Anybody got some ideas?
Title: Re: Electronics and Batteries
Post by: Pusher Robot on March 15, 2017, 01:55:28 PM
This can happen if you have a layer of oxidation.  Try to abrade the contacts with fine sandpaper.  Don't use steel wool unless you are very confident the battery is completely discharged.*

* Lesson learned the hard way
Title: Re: Electronics and Batteries
Post by: The Latinist on March 15, 2017, 03:27:18 PM
 The problem is, the oxidation is likely on the contacts inside the camera. It may be impossible to reach them.
Title: Re: Electronics and Batteries
Post by: Friendly Angel on March 15, 2017, 03:39:36 PM
The problem is, the oxidation is likely on the contacts inside the camera. It may be impossible to reach them.

The thing is though, it works with some of my batteries but not others... that makes me think it's not the camera contacts.

And those little contacts on the batteries are so thin, I think sand papering them would leave nothing behind.  Maybe I'll try it on one of the older ones.

Nobody's ever used the conductive gel stuff?
Title: Re: Electronics and Batteries
Post by: Fast Eddie B on March 15, 2017, 05:09:35 PM

Nobody's ever used the conductive gel stuff?

Aircraft owners often use this stuff:

Stabilant 22, 5ml Kit Makes 30ml of 22A - 22 https://www.amazon.com/dp/B001E50GQS/ref=cm_sw_r_cp_tai_Z0AYyb4GZ76RS (https://www.amazon.com/dp/B001E50GQS/ref=cm_sw_r_cp_tai_Z0AYyb4GZ76RS)

Title: Re: Electronics and Batteries
Post by: Friendly Angel on March 15, 2017, 05:12:42 PM

Nobody's ever used the conductive gel stuff?

Aircraft owners often use this stuff:

Stabilant 22, 5ml Kit Makes 30ml of 22A - 22 https://www.amazon.com/dp/B001E50GQS/ref=cm_sw_r_cp_tai_Z0AYyb4GZ76RS (https://www.amazon.com/dp/B001E50GQS/ref=cm_sw_r_cp_tai_Z0AYyb4GZ76RS)

Thanks!  $65!  Fortunately it comes in packages for smaller applications.
Title: Re: Electronics and Batteries
Post by: SQ the ΣΛ/IGMд on March 15, 2017, 07:33:01 PM
Dielectric grease is probably what you're referring to. I use it all the time.
I'm an electronic tech so I'd have no problem opening that thing up and checking the contacts.
But if you're new to it, probably not a good idea.
Likely those contacts corroded or bent slightly.
Title: Re: Electronics and Batteries
Post by: stands2reason on March 29, 2017, 12:14:50 PM
Are the batteries the exact same size? Also, did you check the voltage on the batteries to ensure they are in good condition? You should see 3.7-4.0+V.
Title: Re: Electronics and Batteries
Post by: Friendly Angel on March 29, 2017, 12:22:18 PM
Are the batteries the exact same size? Also, did you check the voltage on the batteries to ensure they are in good condition? You should see 3.7-4.0+V.

Some are a little tighter than others.  Some are a little older than others.  I don't have a proper voltmeter but I do have a battery checker and it looks like the voltage is good.  The meter has a selector switch for 3.0v and they show very strong.  (the batteries that work and the ones that don't show the same reading).

(http://www.microbattery.com/core/media/media.nl?id=4656&c=ACCT84789&h=a35845d344a20d0b840c)

I ordered a couple new batteries and some of this stuff:

(http://www.all-spec.com/UserFiles/Images/Products/caig-8211_g100l2c_DV_WebXL.jpg)
Title: Re: Electronics and Batteries
Post by: daniel1948 on March 29, 2017, 07:43:59 PM
When I was doing ham radio, I often used plain paper to clean contacts. It worked very well.
Title: Re: Electronics and Batteries
Post by: Friendly Angel on April 05, 2017, 11:47:36 AM
I ordered a couple new batteries and some of this stuff:

(http://www.all-spec.com/UserFiles/Images/Products/caig-8211_g100l2c_DV_WebXL.jpg)

OK, well that stuff brought 4 of my 7 batteries back to working order.  And the new batteries even brought my old camera back to working order - I bought  a new camera because it seemed the old one had some kind of firmware problem but now it seems it was all a battery problem.  Some combination of reduced voltage after many recharging cycles, and reduced contact efficiency made the camera not even power up.

I still need to get a multimeter - just seems like something a guy like me has in his tool box.
Title: Re: Electronics and Batteries
Post by: Fast Eddie B on April 05, 2017, 12:25:43 PM
I still need to get a multimeter - just seems like something a guy like me has in his tool box.

Definitely.

They're pretty cheap. In fact, Harbor Freight periodically gives them away with a coupon - even without they're only $5.99.

http://t.harborfreight.com/7-function-digital-multimeter-69096.html (http://t.harborfreight.com/7-function-digital-multimeter-69096.html)
Title: Re: Electronics and Batteries
Post by: SQ the ΣΛ/IGMд on June 16, 2017, 07:30:46 PM
Mine cost almost $1000. But again, I do this for a living.
It's pretty sophisticated.
Title: Re: Electronics and Batteries
Post by: UnicornPoop on June 16, 2017, 10:20:48 PM
I used to clean my cassette tape heads with a qtip dipped in alcohol. It seemed to breathe new life into them.

Then again, I also licked my phone connector when plugging into the modem and that worked well also.


Sent from my iPhone using Tapatalk
Title: Re: Electronics and Batteries
Post by: The Latinist on June 19, 2017, 09:38:55 AM
Mine cost almost $1000. But again, I do this for a living.
It's pretty sophisticated.

Oscilloscope?  Is it a Fluke?
Title: Re: Electronics and Batteries
Post by: SQ the ΣΛ/IGMд on June 19, 2017, 11:07:43 PM
Mine cost almost $1000. But again, I do this for a living.
It's pretty sophisticated.

Oscilloscope?  Is it a Fluke?

It is a fluke.
No oscilloscope but it has loop power, diode tester and a hundred other cool features.