How often to replace the battery in a red dot and a weapon light

A red dot that went dark or a weapon light that flickers is the silent failure of anyone who carries every day. The firearm is fine, but the accessory on it doesn't work when it counts. Batteries are the simplest part to replace and one of the easiest to forget.

Important: battery life depends on the model and on use. The manufacturer's instructions come first over any number here. Optics and lights can differ a lot from each other.

Optic (red dot)

• Common interval: many people replace the battery once a year on a fixed schedule, even if the optic still works. Some models last much longer, but preventive replacement is cheap.
• The dot: if it's dim, flickering, or off when you tilt the gun, replace the battery now.
• Auto shut-off: if your optic has one, make sure it's on and suits how you carry.
• After replacing: check the battery type and the seal of the compartment, and at the range check that the zero hasn't moved.

Weapon light

• Common interval: on a light used for carry, many people replace the battery every six months to a year, and after any long use.
• Signs: weak output, flicker, or cutting out after a short time.
• Wrong battery: a battery type other than the one the manufacturer specifies can damage the light.
• Storage: batteries left in a gun for a long time can leak. If you store a firearm for a long period, check them.

Zero check

After a battery change, a re-mount or a knock, make sure the optic is still zeroed. Do that at a licensed range, by shooting, not at home.

How not to forget

The simple way is a reminder. In Kadurim you can add a maintenance item to each firearm, for example "optic battery every 12 months" or "light battery every 6 months", and tap "Done" after you replace it. When it's due, the item appears on your home screen. The same works for the recoil spring and magazines by rounds, and for cleaning.

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This article is general information only and does not replace the manufacturer's instructions. Optics and lights differ between models, so check the recommended interval with the manufacturer.