I have a Sony a7iii and a7riii both with battery holders so I use two batteries at the same time. I have enough Sony batteries for a full day of shooting. I won't be using third-party batteries, and frankly, you shouldn't be doing that with $2,000-$4,000 cameras. But for charging. I have 2 of these to charge both sets of batteries at the same time while traveling and they are the best. Just turn them on overnight and they're ready to go in the morning! The price is very cheap and worth it if you're doing multiple jobs in a day or two.
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