I replaced the battery in an LX-7007 Pro IGC about 4 years ago and I
only found one battery inside. As it turned out, I could not find the
correct battery and so bought a couple of battery sockets from Amazon
and removed/replaced the battery socket. It was not difficult to do.

Prior to replacing the battery, my unit would be completely dead and
needing to reload the databases before each flight. I never did like
the thing and quickly replaced it with a ClearNav II.

Now, if you're talking about a Garmin 396 which came from the factory in
my Stemme, it has a rechargeable button battery buried deeply inside the
unit. When it dies, the unit forgets where it is and will not reload
the almanac. Garmin wanted $400 to replace the $2 battery but I found
complete instructions, including pictures, on line. I had to remove t
or 3 circuit cards but, other than delicate cables, it was a breeze.
With the replacement battery it locked on much quicker than I would have
imagined.

Dan
5J

On 2/8/21 10:43 AM, Moshe Braner wrote:
Has anybody needed to replace the internal battery for the GPS?Â* What
type of battery is it?

The GPS battery presumably runs the real time clock in the GPS module.
If this battery fails, when you start up the device the GPS screen will
not show the correct time of day until signals from the GPS satellites
are received.Â* Also the GPS screen will not show the previous lat/lon
while it searches for the current location.Â* And it will probably take
longer than normal to acquire a GPS location fix.

This is distinct from the internal coin battery for the IGC security,
which presumably also powers the memory that stores the user settings.

It seems that on my unit BOTH batteries need replacement.Â* Does that
make sense (about 11 years since factory)?