Garmin 128 'how to' CMOS internal battery swap as requested

[NickRobinson]

Thanks to the advice here as to the correct tabbed batteries,
The symptoms were forgetting the chosen NMEA setting and defaulting to Garmin which the NASA repeater could not read.
View attachment 39211
Tha screws on the back, no glue to prise open

View attachment 39212
1.50 delivered for two from Ebay CR2032's
eg.. http://www.ebay.co.uk/itm/321146212...X:IT&_trksid=p3984.m1439.l2649#ht_5352wt_1030 (no connection)



View attachment 39213
One opening I could see the last rough but obviously functional replacement



View attachment 39210
All working, including the correct time/date without resetting (where from? another cmos? from the satellites?)

I spent Monday night onboard and repeated my tests the next morning as someone had commented on quick battery drain, OK so far as you'd expect.

btw- when you send a PC sourced route to the 128 and it fails to arrive, move off 'route 0' and it'll appear.


There were more pics but the forum says I've exceeded my u/load limit, which is about 8 pics and I can't be faffed using a pic site.

Nick

 

[nigelmercier]

I don't know what that gold thing is in the battery picture, but I want one.

 

[NickRobinson]

I don't know what that gold thing is in the battery picture, but I want one.

Sonic screwdriver........ or Aldi multitip jeweller's jobby.... who knows?.....

N

 

[ShinyShoe]

Is it not a desoldering tool?

 

[AngusMcDoon]

In case anyone is thinking of soldering a wire directly to a lithium cell without tabs as in picture 3 (the battery that was replaced), don't do it. You are at a high risk of exploding the battery and a lithium fire is bad for your health. Get a proper tabbed cell as the OP suggests, and even then use a hot iron and solder quickly. Don't cook the battery with the soldering iron.

 

[lustyd]

In case anyone is thinking of soldering a wire directly to a lithium cell without tabs as in picture 3 (the battery that was replaced), don't do it. You are at a high risk of exploding the battery and a lithium fire is bad for your health. Get a proper tabbed cell as the OP suggests, and even then use a hot iron and solder quickly. Don't cook the battery with the soldering iron.

Alternatively, use a battery holder and put the battery in once soldering is complete. They are about the same size as the battery but allow easy replacement in future without a soldering iron

Well done to Nick for posting with good pics, this comes up quite often.

 

[bitbaltic]

nice post

we have twin 128s, the day for battery replacement hasn't come up yet but I will bookmark this for future reference as it surely will!

Cheers

 

[FWB]

11 years and still ok, but bookmarked also. Thanks