Top Red Dot Sights: How Long Do Their Batteries Last?

Chris G.

The power source for your firearm’s red dot sight is its lifeline. Have you ever considered how long these batteries can provide your optic the necessary power? Understanding their lifespan is important for ensuring the consistent dependability of your equipment.

The life of these batteries can differ greatly depending on the model, brand, and several other factors. Let’s check out and learn more about batteries. We will also identify some leading red dot sights on the market and how long their batteries can energize them.

Common Kinds of Batteries that Power Red Dot Sights

Being electronic devices, red dots use a power source, usually a battery of some sort. Red dot sights commonly use various types of batteries to power their illumination systems. The specific type of battery depends on the design and model of the sight. Here are some common types of batteries used for red dot sights:

  1. Coin Cell Batteries (CR2032, CR1632, etc.): These small, flat, button-shaped batteries are widely used in many red dot sights. CR2032 is a common size for these sights, but others like CR1632 may also be used.
  2. AAA Batteries: Some larger red dot sights, especially those with more features or larger housings, may use AAA batteries. These cylindrical batteries are larger than coin cells and provide more power.
  3. AA Batteries: Similar to AAA batteries, some larger red dot sights or magnified optics with integrated red dot sights might use AA batteries, which are larger and offer longer battery life.
  4. Watch Batteries (e.g., 1/3N): Compact and commonly used in smaller red dot sights, these batteries are often found in the form of a coin cell. The 1/3N size is a common choice.
  5. CR123A Batteries: Larger and more powerful than coin cells, CR123A batteries are used in some high-performance red dot sights and other electronic devices. They are cylindrical and commonly found in tactical optics.
  6. Rechargeable Batteries: Some red dot sights are designed to be compatible with rechargeable batteries such as rechargeable versions of the coin cell batteries (e.g., rechargeable CR2032).

What Factors Affect the Battery Life of Red Dot Sights?

How long does a red dot sight battery last? Well, it depends on various factors. Understanding these factors can help users optimize the performance and longevity of their red dot sight batteries. 

  1. Brightness Settings: Higher brightness settings on the red dot sight require more power. If you frequently use the sight at a higher intensity, the battery will deplete more quickly. 
  2. Quality of the Battery: The quality and brand of the battery used in the red dot sight can influence its performance. Higher-quality batteries usually provide more lasting power.
  3. Temperature Extremes: Extreme temperatures can affect battery performance. Cold temperatures can reduce battery efficiency while high temperatures may cause the battery to drain more quickly. Storing the firearm in a climate-controlled environment when not in use can help lessen these effects.
  4. Usage Frequency: The more frequently the red dot sight is used, the faster the battery will drain.
  5. Sight Design and Technology: Different red dot sight models have varying power consumption based on their design and the technology used in the sight. Advanced features, such as motion sensors or sophisticated electronics, may impact battery life differently. 

Red Dot Features that Extend Battery Life

a man holding a red dot optics in broad daylight

Manufacturers of red dot sights are continually working on improving energy efficiency and implementing features to extend battery life. Here are some features commonly found in red dot sights that contribute to prolonged battery life:

  1. Auto-Off Function: Many red dot sights include an auto-off feature that automatically turns off the sight after a period of inactivity. This helps conserve battery power when the sight is not in use. Users can typically customize the duration of inactivity that triggers the auto-off function.
  2. Motion-Activated Technology: When the sight detects motion, a sensor turns the powers on. When it detects no motion for a set period, it enters a low-power state or turns off. This feature helps save battery life by minimizing the time the sight spends in an active state.
  3. Adjustable Brightness Settings: Red dot sights with adjustable brightness settings allow users to match the reticle’s brightness to the ambient lighting conditions. Lowering the brightness when shooting in well-lit environments can significantly extend battery life.
  4. Solar Panels: Certain red dot sights feature integrated solar panels that harness ambient light to power the sight. These solar panels help supplement battery power and can extend the overall lifespan of the battery.
  5. Sleep Mode or Standby: Some red dot sights have a sleep mode or standby function that puts the sight into a low-power state when not in use. This reduces power consumption without fully turning off the sight, allowing for quick activation when needed.
  6. Efficient Electronics and Components: Advances in technology have allowed manufacturers to design red dot sights with more energy-efficient electronics and components. These improvements contribute to overall power efficiency and longer battery life.
  7. Battery-Saving Reticle Designs: Simple reticle designs, such as a single dot, consume less power than complex reticles. 

Best Red Dots and Their Battery Lifespans

Let’s check out some of the most popular red dots and how long their battery usually lasts.

  1. Aimpoint PRO (Patrol Rifle Optic)
    • Battery Life: Up to 30,000 hours (on setting 7 out of 10).
    • Features: Durable construction, always-on illumination, and a clear 2 MOA dot.
  2. EOTech EXPS2
    • Battery Life: Approximately 600 hours at nominal setting.
    • Features: Holographic reticle, compact design, and quick-detach mount.
  3. Vortex Optics Crossfire Red Dot Sight
    • Battery Life: Up to 7,000 hours on the lowest setting.
    • Features: Affordable option, multiple brightness settings, and shockproof design.
  4. Holosun HS403C
    • Battery Life: Up to 50,000 hours (solar panel assists the CR2032 battery).
    • Features: Solar failsafe, multiple reticle options, and durable construction.
  5. Trijicon MRO (Miniature Rifle Optic)
    • Battery Life: Up to 5 years of continuous use at brightness setting 3 (on a mid-range setting).
    • Features: Large aperture, clear lens, and rugged design.
  6. Sig Sauer Romeo5
    • Battery Life: Up to 40,000 hours (on the lowest settings).
    • Features: Motion-activated illumination, compact design, and various mounting options.
  7. Bushnell Trophy TRS-25
    • Battery Life: Approximately 3,000 hours on the highest setting.
    • Features: Affordable, compact, and shockproof design.

What red dot sights don’t use batteries? There are only a few. Some have solar panels, but these are meant to augment the battery or for emergency use if the battery runs out. Those that don’t rely on a replaceable battery have internal batteries. Let’s check out some of them:

  1. Holosun HS503C
    • Power Source: Solar panel assists the CR2032 battery.
    • Features: Solar failsafe, multiple reticle options, and Shake Awake technology.
  2. Holosun HS510C
    • Power Source: Solar panel assists the CR2032 battery.
    • Features: Open reflex design, multiple reticle options, and Shake Awake technology.
  3. Trijicon SRS (Sealed Reflex Sight)
    • Power Source: Solar panel assists the AA battery.
    • Features: Large aperture, clear lens, and rugged design.
  4. Aimpoint CompM4s
    • Power Source: No solar or battery assistance; relies on the built-in battery.
    • Features: Long battery life, durable construction, and night vision compatibility.
  5. Trijicon RMRcc (Ruggedized Miniature Reflex Concealed Carry)
    • Power Source: No solar assistance; relies on the built-in battery.
    • Features: Compact design, durable construction, and various reticle options.

How to Prolong the Battery Life of Red Dot Sights

cleaning the battery’s compartment

Extend the battery life of your red dot sight, and squeeze out every iota of juice! Here are some tips to help extend the battery life:

  1. Adjust Brightness Settings: Use the lowest brightness setting that provides a clear reticle in ambient lighting conditions. Increase brightness only when necessary such as in bright outdoor environments.
  2. Utilize Auto-Off Features: Enable the auto-off function if your red dot sight has one. This feature automatically turns off the sight after a period of inactivity, saving the battery.
  3. Turn Off Sight When Not in Use: If your red dot does not have an auto shutdown feature, manually turn off the red dot sight when you’re not using it.
  4. Choose the Right Battery: Use high-quality, reputable batteries from trusted brands. Consider lithium batteries, as they often provide longer life and better performance, especially in extreme temperatures.
  5. Monitor Battery Levels: Regularly check the battery status of your red dot sight. Replace batteries preemptively before they completely drain to avoid unexpected failures.
  6. Store Firearms Properly: Extreme cold or heat can affect battery efficiency, so storing the firearm in a well-insulated case or compartment.
  7. Use Rechargeable Batteries: If your red dot sight supports rechargeable batteries, consider using them to reduce long-term costs and environmental impact. Ensure the rechargeable batteries are fully charged before use.
  8. Clean Optics Regularly: Keep the lens and optics clean to ensure optimal light transmission. Dirty lenses may make the reticle look dim, forcing you to increase its brightness. This would lead to increased power consumption.
  9. Choose Sights with Power-Saving Features: Consider red dot sights with features like motion activation, solar panels, or fiber optics to supplement or extend battery life.
  10. Keep the Sight Shockproof: Ensure that your red dot sight is securely mounted and shockproof. Excessive recoil or vibration can impact the internal components and contribute to power drain.


How long does a red dot sight battery last? It depends on a variety of factors. Knowing these factors allows you to squeeze every bit of energy from your red dot sight’s battery.

Check your red dot sight’s manual to identify the features that allow it to save battery power. By familiarizing yourself with your optic, you can enjoy it for a long, long time.

About the author

The name's Chris. Just a regular dude who loves firearms. I've been shooting since I was a kid. My old man taught me the ropes.

I'll never forget the first time I missed an easy shot on a buck, thanks to a bum scope. The image was fuzzier than my dog's butt. After that, I got obsessed with understanding scopes. What makes the good ones tick and the bad ones trash. After a few years and a few thousand bucks, I learned what separates the winners from the losers. Once I had a good stockpile of knowledge, I launched this site.

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