Replacing the Internal Battery in an X76 Garmin

Discussion in 'Mapping & Navigation' started by tsizmo, May 19, 2008.

  1. tsizmo

    tsizmo n00b

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    #1
  2. tsizmo

    tsizmo n00b

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    Ok first remove the screws from the box shell
    and the ring of the antenna base connector

    [​IMG]





    [​IMG]


    carefully lift the aluminium paper behind the LCD screen (dont worry it has only soft glue)

    [​IMG]



    remove PCB screws

    [​IMG]


    [​IMG]


    at the back of the PCB you can see the battery

    [​IMG]


    [​IMG]



    [​IMG]



    It's a VARTA MC621

    [​IMG]


    Replace and voyla... no more acquiring satellites delay :thumb
    #2
  3. intr1gue

    intr1gue Been here awhile

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    ...and that's how it's done. people ask a question, and the Internet serves up a couple casual responses and one ridiculously well documented response.

    Thanks much. I'll do this and get back pronto.

    --Ranjan
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  4. ebbo

    ebbo Been here awhile

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    That’s what probably happened to mine, same symptoms, cost me just over £100 when I sent in to Garmin for service :cry

    It probably means they’re all destined to fail some time after 3 years, as mine did :huh


    According to the Varta life expectancy of Varta MC621
    10%DOD - 1000 cycles
    100%DOD - >200 cycles
    Deep Discharge - >100 cycles

    DOD = Depth of Discharge
    #4
  5. tsizmo

    tsizmo n00b

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    :nod totaly agree..!! For something so simple, Garmin keeps us in the dark...
    ...wondering why... $$$ :bluduh
    #5
  6. jktpa

    jktpa X-Troller

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    one of the ways to get by the phone wait is to use the marine service this works with 276's and 176's since they are really marine chart plotters.
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  7. Noblehops

    Noblehops Misfit

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    You sir, are a prince. The hardest part of this endeavor will now be finding that battery online.

    THANK YOU, very much.

    Nils</snip-o>
    #7
  8. JDLuke

    JDLuke Ravening for delight

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    You are the man. My 276c is way too new to do this, but I'm stashing this information away for the inevitable.
    #8
  9. Noblehops

    Noblehops Misfit

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    OK, this battery is actually discontinued by the manufacturer, although I was finally able to track it down online. So it's written down somewhere, this is what I learned:

    It's a Lithium Ion rechargeable battery
    it's 3.0 volts
    it's 3.0 mAH (milliamps)
    It measures 6.8 mm in diameter
    It measures 2.15 mm in height.

    This online battery retailer (Apex Batteries) had it, but it was obfuscated with a really long part number including some superfluous information.

    http://www.apexbattery.com/mc62160621-101-511--rechargable-lithium-battery-lithium-batteries.html

    They have it listed as
    MC62160621-101-511 - Rechargable Lithium Battery

    I bought 2 :-)

    Nils
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  10. tsizmo

    tsizmo n00b

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    ..no worries man, just put ANY 3.0 volt battery that fits (a little larger will also do the job) thus more milliamps more battery life.. :bubba

    A friend of mine already put a larger sanyo battery and his GPS is working fine..


    also remember to "scratch" both the battery poles before using the soldering gun..

    cheers..
    Jim
    #10
  11. intr1gue

    intr1gue Been here awhile

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    Of course, one additional question: is there an o-ring or something that needs to be replaced when you replace this battery? I know when you unseal watches sometimes the ring needs to be replaced, or else the thing's no longer watertight...is this a problem or will it stay watertight even after it's been opened and put back together again with the original ring?

    --Ranjan
    #11
  12. tsizmo

    tsizmo n00b

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    no problem for me..
    the "o-ring" is a heavy duty rubber seal
    Just remember to carefully wipe it before closing the unit
    with a soft slightly wet cloth..


    i've wash the GPS a couple of times at home
    and also did a big trip last September with
    lots of km under heavy rain ...no problem at all
    #12
  13. 9Dave

    9Dave Bazinga!

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    This is so good, it deserves its own thread.

    Dave
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  14. Noblehops

    Noblehops Misfit

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    OK, I tore into it, as my GPS is about 4 years old, and although a reset did speed it up, it seemed like a matter of time before the battery croaked, and it didn't seem too fiddly.

    Disassembly went fine, but when I got to the battery itself, it looked like it had been spot welded with the world's smallest spot welder. If you look closely at the close up photo you will see a pair of teeny dots. That's what I found.

    Forging ahead I wiggled an Xacto blade in there and gently freed the battery. But how to reinstall? I attempted to put a teeny dot of solder on the two contacts that sandwich the battery, but it would not stick to the battery, nor could I get it hot enough to stay molten and get the battery on it.

    Along the way I fear I shorted the new battery with solder, and I don't want to chance putting that one in. I'm going to order another.

    I took some crazy glue to one of the now un-trusted batteries and tried sticking it to some pot metal. Presto! it's stuck hard. But is that kosher? Is ther some magic PC glue that is conductive?

    I can't imagine how the heck I'm going to fix this any other way than gluing it on. Suggestions, pointing and laughing, etc are welcome.

    Nils
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  15. JDLuke

    JDLuke Ravening for delight

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    Perhaps a bit of emery cloth to roughen the surface of the battery would allow the solder to take hold? :dunno

    Oh, almost forgot: :lol3
    #15
  16. 9Dave

    9Dave Bazinga!

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    Look at post 10. The OP said "scratch" the battery. I bet he is saying rough it up so you can get the solder to adhere.

    A little dot of an electronic safe flux would help as well.

    Dave
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  17. Noblehops

    Noblehops Misfit

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    Yeah, I tried that, it still wouldn't stick and another problem is soldering the underside. You can heat up the solder till molten, remove the iron and attempt to place the battery on it, but the battery is so cold it sets up the solder instantly before it can adhere. Solder isn't going to be the answer, at least not for me.

    The Google coughed up this with a little coaxing:

    http://www.wireglue.us/

    In addition, I found some recipies for homemade conductive glue using contact cement and graphite, but seeing as I have neither laying around, I ordered the wire glue, and fresh unmolested batteries.

    I will photograph and document what happens next when I get it, but for the moment, I wouldn't advise folks blazing ahead with this project without a plan in place for how to reinstall this thing.

    Nils
    #17
  18. Frank Warner

    Frank Warner Traveller

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    You should be able to order the batteries with the weilded on tags .. than just solder the battery tags to the tags on the board... (not as cheap as teh plain jane battery .. and not avalible in teh drug store).
    Conductive glue should ba avalible at radio shack, farnell, and other electronics suppliers .. it will not be cheap ..
    #18
  19. tsizmo

    tsizmo n00b

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    You are right this problem might happen, my only advice to this (don't laugh:wink: ) is to try several brands of batteries with the same characteristics.

    some of them are real pain in the ass when it comes to solder (try Sanyo batteries)
    #19
  20. Noblehops

    Noblehops Misfit

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    OK, it's done, and the glue worked perfectly. Success! :D

    Here's a commented gallery on Smugmug detailing how I did it.

    http://noblehops.smugmug.com/gallery/5658077_RE9aP#348168332

    Edit: The Wire Glue folks do not sell direct. After one aborted attempt to purchase from a mom and pop, I got it from Edmunds Scientific: http://scientificsonline.com/product.asp?pn=3035852&bhcd2=1218308292

    They shipped it the next day for a pretty reasonable cost.
    #20