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Unfortunately that isn't possible with the Sightmark 4K because the internal rechargeable battery is sealed inside. There's no ability to access the battery directly, there is only a USB-C charging port.

The Sightmark 4K max isn't a thermal optic. just IR night vision; it also has an internal rechargeable battery so using a different battery isn't an option. I believe an external battery pack can be used, but only to either charge or extend the run time. The OP didn't indicate if their optic...

Now worries @Nvr. Hopefully Sightmark is working on a fix for this issue.

The sightmark 4K still freezes up after loading the most recent firmware version. The firmware hasn't been updated since 2021. I think the firmware has a flaw in it that is causing the optic to freeze when the power button is quick pressed. I think it's a programmatic issue because the power...

I have been having a similar experience with the 4K max. There is a reset button on the top so you shouldn't have to wait for the battery to drain down. When I got my first 4K max, the first thing I did was update the firmware to the current version. I have mine mounted on an AR platform so...