Trickle charger for SL550 recommendation?

I have bought a used 2014 SL550. I am going to drive it only in summer and autumn, and so would like to get an appropriate trickle charger to keep the battery from going dead during winter. Any recommendations of which CTEK model will be suitable? Thanks !

I have bought a used 2014 SL550. I am going to drive it only in summer and autumn, and so would like to get an appropriate trickle charger to keep the battery from going dead during winter. Any recommendations of which CTEK model will be suitable?
Thanks !

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