A good quality compatible battery that doesn't have warning messages or hide the battery amount can not only save you money, but increase your inventory of available battery power for long video or photo days. For the Sony A7 IV, A7S III, A7R IV I've been using these great compatible batteries that seem to last about 85-90% as long as the factory Sony NP-FZ100 Camera Batteries.
Links:
NP-FZ100 Compatible: https://geni.us/1JCSLBP
Rokinon 24mm F1.8 AF for Sony E mount: https://geni.us/1JCSLBP
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