How Long Should My Flashlight Battery Last

If you’re looking for your next flashlight, you might also want to consider the type of batteries it’s compatible with. Why? Because that’s what the purpose of you buying your flashlight – so that it’s powerful, it lasts longer, and it’s efficient. But how long should my flashlight batteries really last? 

It’s a relative question – and in fact, it’s something dependent on how you use it. There are batteries, however, that even if you use it often, they won’t die out on you as quickly as the others. In this article, we will be discussing how long the batteries on your flashlight should last. 

Different battery types for flashlights

Similar to any other device, flashlights have different variations in batteries, too. In fact, in choosing the best type of battery for your flashlight, it will depend on the compatibility between the flashlight and the battery. 

But to give you a better idea, batteries are usually grouped in what they’re made of. Hence, here are the most common types of flashlight battery materials:

  • Silver alkaline
  • Lithium (Best choice)
  • Nickel-Cadmium
  • Lead-acid
  • Oxy-hydroxide 

The battery material is actually the one responsible for its longevity. In fact, reporters claim that what those ads say about the time period of when the battery will last is true. It’s also in conjunction with its price. For instance, heavy-duty batteries are going to be cheaper because they won’t last as long as alkaline batteries.

What controls a flashlight’s battery life?

Many of us believe that the only thing concerned in determining the battery life of your flashlight is when it’s turned on. However, that may not be the case. In fact, there are other factors needed to be considered when we’re discussing the battery life of a flashlight.

Flashlight Battery Run-time

Of course, it’s quite obvious that having a flashlight turned on is the main key in determining how long its battery would last. Try and turn a flashlight on for a straight hour and see when it starts to get dim. That will tell you if the flashlight you bought doesn’t have high standards – or if the battery you’re using is not that good in terms of the material and the quality.

If you purchase a flashlight with an incandescent bulb which uses 4 D alkaline to 2 AAs would make the batteries lose power at an accelerated rate. This means that in 6 months of using it regularly, you won’t be able to use it as effectively as it was newly bought – it can even go dead in about 30 minutes during that time. 

If you want to see the best flashlights we have reviewed that have the best battery run times, take a look at our comparison here.

Typical Flashlight Battery Shelf Time

Another important factor most people fail to look at is the shelf life of a battery. Although it is worth noting that batteries that aren’t installed on any devices are more natural – they’re less likely to die out sooner than their expected lifespan. 

Alkaline batteries or heavy-duty batteries have a standard shelf life of 5 to 7 years – which is impressive. Lithium batteries, however, can have a shelf life of up to 10 years if properly used and maintained. 

However, if you install the batteries on a flashlight and had it turned it on, chemical reactions have taken place which can diminish the shelf life of the battery; it can go flunk in its 6th month. 

Flashlight Battery Temperatures

Extreme temperatures are also one of the most important factors of your flashlight’s battery life. When a battery is exposed to either a super hot or a super cold environment, it can decrease its shelf life to as much as 50 percent. Meaning, if you live somewhere where it gets extremely cold or extremely hot, your flashlight’s batteries will be dying up on your pretty quickly than the norm. 

For instance, if you decide to use it on a camping trip and the temperature is at 7 degrees Celsius, it might not perform as well as it could during under normal temperature. 

Final Words About Flashlight Batteries

In conclusion, the batteries on your flashlight would last depending on the type of flashlight you have. Say, you have an incandescent flashlight, once the battery is put in and you turn it on even for just 5 minutes, it’ll have adverse effects and it can kill the flashlight in 6 months. 

LEDs, on the other hand, are much more reliable. Even after you install it and use it for a couple of minutes, leaving it in a bag and getting it out again after a year or two will still power it up pretty normal. It won’t go dead or dim for minutes; it’s still going to power up for hours.

One good tip we can leave is you is to purchase batteries for your flashlights in bulk. Since both alkaline and lithium batteries have a shelf life of more than 5 years, it’s still going to be cost-effective, even if it’s not used right away.

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