... which it does automatically when it's plugged in, so also no battery drain, except if you do this manually.Just having iCloud turned on is not supposed to drain battery, but the battery might be drained, at a faster, though not at a significant rate when iCloud backs up your device contents.
... which it does automatically when it's plugged in, so also no battery drain, except if you do this manually.![]()
I have an iCloud account, so Safari and other apps are synced. I don't notice any significant battery drain. Also, when you want to backup manually through iCloud, it just needs a few minutes (when you do this for the first time, it will need more time). No battery drain here as well. If you set up backing up automatically, then it will do this when it's plugged in, so absolutely no drain in this case.
Can it drain? Yes, everything drains. Will it be a significant amount that you can see? Probably not unless you have data fetching/pushing from the iCloud email account.