Battery life
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Battery life

Although both the a7 II and a7R II have relatively poor rated battery life, it is possible to charge the cameras over USB, and you can continue shooting while they're charging.

With a CIPA-rated battery life of 350 shots, the a7 II offers greater endurance than the a7R II, which clocks in at a mere 290 shots per charge. But it's a bit of a stretch to call 60 hypothetical exposures a 'key difference' in battery life. Honestly, they're about in the same ballpark, and both are pretty poor. Both the a7 II and a7R II offer significantly less endurance than equivalently-priced DSLRs at 350 shots and 290 shots per charge, respectively (CIPA standard in both cases).

The a7 II has a better CIPA-rated battery life than the a7R II, but endurance in heavy real-world use from either camera varies from just ok-ish to downright terrible, depending on things like the ambient temperature and the amount of video you end up shooting. We'd strongly recommend taking at least one spare battery out with you when working with either camera, but if possible, take a couple. Ideally, take several. And take the batteries out of the camera if you're not using it for long periods of time: we've found these cameras drain batteries even when powered off.

The somewhat lower quoted battery life of the a7R II can be explained by its more power-intensive 4K capture mode, but even if you're mostly shooting stills and keeping image review to a minimum, don't expect to get through a busy day's shooting with either camera without changing your battery at least once. The good news is that both cameras feature in-camera USB charging and can still be used while charging. This might not help much if you find yourself in the middle of nowhere, but could be a life-saver when shooting at an event or in a studio (or if you have a USB battery pack on you).