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How should I store these lithium Ion batteries to keep them fully-charged?

I have bought a set of lithium ion batteries to power my new GPS machine. How should I store these batteries when I do not use my GPS?
Should I store them OUTSIDE of the unit or should they stay as fresh if I keep them connected inside my GPS with the unit turned off?
And should I leave the batteries inside my unit when I leave my GPS connected to my computer through the USB port?
This is a GARMIN GPSMAP 60Cx unit.

The things that decrease the life of Li Ion batteries are:

The rate at which they are charged
The rate at which they are discharged
The number of charge/discharge cycles.
High temperatures
Prolonged periods at full charge
Charging/discharging at temperatures below about 30F

The first 3 you can’t do much about, the charge/discharge rates are set by the designer of the charger and the designer of the equipment they are powering. The number of charge cycles you can’t control except by not using the batteries which defeats the whole point of having them.

As for the last three you can follow some simple guidelines:
When not using them for a couple of weeks store at 35-50% charge and at room temperature.
When connected to the computer take the batteries out unless you need to charge them.
Avoid leaving them in the car on warm days or cold nights.

There are some trade offs, you don’t want to store them fully charged but you don’t want to put extra charge/discharge cycles on them either so what do you do if they are fully charged and you aren’t planning on using it for a while?
The answer is it depends on how long you plan to leave them and what temperature they will be stored at. A week or too full charged isn’t a big deal if they will be at 70F or less but if they are going to be somewhere that is going to get hot then you want to discharge them a bit first. High temperatures and full charges are the real killer, that’s why the batteries of a laptop that’s kept plugged in the whole time won’t last very long after a while.

The unit probably won’t take much power when switched off so keeping the batteries in or out when not in use probably won’t make much difference unless you’re planning on leaving it for months.

Li-Ion battery burnout

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