Consensus on replacement battery

[RPNerd]

What's the consensus on replacement batteries for the HP Prime?

Not once have I seen an official HP replacement, so it's got to be a compatible battery.

The guys I've always used for this, duracelldirect.co.uk, no longer sell this battery (I already have one from them and the part number is simply no longer in their inventory, with no replacement).

The alternative is to use a battery for Samsung Galaxy S3, but a replacement battery for a 12-year-old phone is also becoming hard to find. Sure, you can get so-called OEM batteries from the likes of TAS and Amazon, but how far above 90% is the probability that they're fakes/knock-offs that will quickly turn into spicy pillows?