Sony Lithium-Ion Rechargeable Camera Battery for Sony a9 and a7R III Cameras (NP-Z100)

Major improvement in the "Z" battery used for the a7rIII vs the "W" battery used in prior generation noted for their short battery life. The good news is that never had a fresh battery change mandated during a shoot like routinely happened with the "W" in the a7rII, but is always good to have a spare. When you see the other one low before going on a shoot, put a fresh one in and know won't need a backup as the other one is in the charger. While more expensive than generic...you only need one and assured that will support the electronics in the camera without false readings. Stick with Sony.

After trying so many knock-offs that claim they are as good as OEM, but really they last about half the time as the OEM, I decided to spend $80 for this battery and it's worth the money! It's so nice just to carry around 2 Sony OEM batteries vs 4-5 knock offs! Listen here, if you have money to buy an A7III, A7II, A6600, A7R, A9, etc. then please, why are you being cheap and buying knock-off batteries? Just spend $80 ya cheap-skate! I've learned my lesson. Also, there is a small chance knock-off batteries can disrupt your electrical current in your camera!

This battery is simply amazing. How do they get so many mAh's into a package that is almost the same size as the FW50? My a6500 and RX10 Mark IV all use the FW50, but my a7R Mark III uses this battery and it has changed my work flow on set. I bought the a9 battery grip and run 2 of these batteries, I can almost go all day long now. THANK YOU Sony for listening to us on the battery problem. I would love to see a similar efficient technology to this FZ100 (size and weight to mAh ratio) in the NP-BX1 and the new J series battery for the RX0. Sony mirrorless is great, but a battery like this FZ100 makes the battery life at least comparable to DSLR equivalents. Though even those batteries aren't getting as good of a ratio on weight to mAh.