Garmin 111 Personal Navigator

Can you supply the full name of your garmin unit as 111 or iii or III is used on a few different units, if your unit is the Garmin GPS III Plus there is a PDF that covers battery replacement, note that the 'Plus' has a rechargeable battery but the none plus is sometimes reported as having a non-rechargable battery so you must check what is in your unit and replace with it with the same type

 

It isn't the 'Plus'

 

I would guess the way of getting the case open will be the same, I would also guess that you would de-solder or cut out (leaving tags sticking out), in the same way, however you would need to clearly indentify what battery is fitted some batteries fitted to Garmin devices are not re-chargeable and although I think an exploding battery is an extreme outcome, trying to charge this type of battery will reduce it's life, on the other hand fitting a re-chargeable battery in error will also reduce it's life as they usually have a smaller capacity, are usually not supplied fully charged, will lose their charge over time (even when not supplying any power) and obviously won't be getting charged by the GPS circuitry

 

It depends how often you use it, it will take longer to get a satellite fix without the backup battery because it holds an almanac of data, but if you don't mind waiting a little longer then that isn't a problem. If you know someone with an electronics background it would be a fairly simple task to change the backup battery

If you are lucky the almanac data may be maintained by the backup battery long enough to allow you to change the AA batteries, if so you would need to ensure that the unit is stored with working AA batteries at all times to avoid the long wait to gain new almanac data

 

You would have to open your unit to determin what battery it contains but if it is the VL1220 I have purchased them from UK suppliers via Ebay in the past, there is one CLICK HERE
Have a search on Ebay

 

Glad to be of help