Imagine this situation:
You are on mountain, and you are there for 2 days. You have battery grip, but it is almost empty, because of cold weather and lots of shooting. Batteries in the flash are still ok, so you might use them in the grip if you have to. You planned to use power from local hotel, but it is closed, and there is no power source arround, so you can't recharge batteries.
And you are going to spend few more days there. If only the weather was not so cold ... (batteries long shorter in cold conditions)
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