My 5th gen iPod classic is still going strong after 8+ years. Haven't babied the battery, either. Same with the shuffles. It's amazing how long some of them can last.

I've still got about 6-7 working Pismo batteries, ranging from ~2200 mAh to ~4500 mAh. Nice to have the option of being uunplugged for about an hour, and of course I can always pop two in if I want to go longer. Won't last forever, but at least for now, most are hanging in there.

When they start to fail, you can see the drop in fully charged mAh pretty precipitously. Every charge, they take a little less.