Picked up a "BatteryMINDer" trickle charger / desuflator. It's similar to the Model 12117 on:

Battery Chargers by BatteryMINDers.com

I have the charger on a disconnected battery in another car this weekend, but I'm thinking I'll use it on the XF over the winter (via the "permanent" pigtails installed on the battery; XF's battery will stay connected to keep the alarm active while in storage).

But ... the charger apparently sends out short bursts to desulfate the battery. Anyone use a BatteryMINDer on their XF yet? If so, for how many seasons? Any damage to the XF's electronics?