The Z30, Z50, and Zfc use EN-EL25 batteries. The Z50II comes with EN-EL25a batteries but can use the original.
- EN-EL25 — (black) 7.6v, 1120mAh (8.5Wh)
- EN-EL25a — (gray) 7.6v, 1250mAh (9.5Wh)
Third party versions of these batteries have also appeared, plus many third-party chargers for the EN-EL25 also exist.
If you're looking for a "dummy battery" for use with AC power, ones have finally appeared from a third party, the F1TP EP-5G and the AliExpress combo. The Glorich version appears to be available from Amazon, but for more money.