Lithium ion batteries work best if they're kept topped up. I'm surprised Apple recommends draining once a month. Completely draining and topping up a LiIon ba

Lithium ion batteries work best if they're kept topped up. I'm surprised Apple recommends draining once a month. Completely draining and topping up a LiIon battery will kill it much more rapidly than keeping it topped up. LiIon will also naturally degrade over time. I think for 90%+ of all lithium batteries (polymer or ion) the battery life will fall off extremely rapidly after 2 years regardless of how you treat it. That said, I still have a handful of batteries that are 5 years old and still work great (for my long-since-discontinued Sony IP55e MicroMV camcorder)