Garmin Cadence Monitor

I have the above device and was just wondering how long the battery should last? I have had it less than a year doing around 1500miles so far and it's stopped working.
Bianchi Via Nirone
Focus Izalco Pro 2.0
Focus Izalco Pro 2.0
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ABCC Cycling Coach
Stopped working does not necessarily equal dead battery. I have a 510 with cadence sensor and mine "dies" occasionally. I find a reset on the cadence sensor itself works wonders.
Focus Izalco Pro 2.0
Is there any kind of warning when the battery gets low? I guess its not a big issue since (a) the HR monitor isn't crucial (b) if the GSC10 stops working I loose cadence (big deal) and the Garmin just uses GPS for speed. As the Garmin will plot the route anyway I would think the route upload to strava would work perfectly even if the speed somehow gets screwed during the ride. Just wouldn't want my RLS100 ride to get lost if the GSC10 battery decides to die.
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