Consensus on replacement battery

[BruceH]

I'm pretty sure HP always said from day 1 that the battery came from a phone [1] and therefore that was where to get a replacement from.[2]

[1] I'd have to look up the exact one to check but the Samsung you mention is almost certainly it.

[2] I find it a great irony that almost all my devices with removable batteries still have working batteries that don't yet need replacing, whereas the ones with built-in batteries have often died.