Dedicated to select Sony cameras, the NP-SA100 Battery is a 2670 mAh rechargeable lithium-ion battery. This high-capacity battery can be charged inside compatible cameras or is compatible with the BC-SAD1 Battery Charger. Also, it supports Sony's Battery Health Check system, which is visible on a camera's monitor, to avoid unexpected battery issues and identify the right time to replace.
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Great battery but way too expensive
It is a battery. It is on the large side, but it works and lasts a long time. I only do photography, and I did not even use half of it after a day of walking around on vacation and taking a few hundred pictures. Because of its boxy dimensions, carrying a spare is somewhat inconvenient if you have a small bag, but it is a minor issue.