If the first letter in the final sequence of letters and numbers is an " A", then the TV is part of our OLED line-up (e.g. KD-48 A9S or XBR-65 A9F).

Having grown up in Yorkshire, I always have the urge to save money! Sometimes I have to remind myself of the adage, "Buy Cheap, Buy Twice!" and "You get what you pay for." Ultimately I think what it boils down to is how much are you willing to spend to save swapping batteries? Clearly the Sony is the superior battery here. So if you want to have minimum battery changes, the least amount of batteries to charge before a wedding then your choice is clear. On the other hand, if you want to save money and don't mind changing batteries more often, then the Powerextra batteries might suit your needs and offer you value for money. I think it is clear that the original Sony battery is without a doubt superior. Which is as it should be given it does cost 2x more than the Powerextra.

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Using the Powerextra, I would clearly have to swap batteries earlier. I'd be nervously looking at the meter and fretting during groups and couples portraits about the remaining capacity.

For a full day of filming, we used to average out at going through three NP-FZ100's per Sony A7iii. With 25% less power per battery, we'd have to now use 4 batteries. An extra change on paper. But the shorter the battery life is, the more I would be stressing about the time to change. Cameras – LCD screen is heavily worn either by de-lamination or has scratches to it. Rubber grips are starting to come away from the body.As I have mentioned though, our desire for longer battery life outweighs the extra cost we need to spend on the Sony batteries. Yes it means we have to pay a bit more but the extra latitude that affords us is worth it in our opinion. Each TV model name is more than just a random sequence of numbers/letters. The name contains model-specific information.