We consider our Maglite Flashlights to be extremely water resistant but we don’t advertise them to be waterproof.

It sounds like you may be using the incorrect replacement lamp for your flashlight. D & C Cell Maglite Flashlights have different numbers of batteries or cells and therefore operate at different voltages, so each size Maglite Flashlight needs its unique lamp size. For instance, if you have a 4-Cell Maglite Flashlight and you put a 2-Cell or 3-Cell lamp inside, it will burn out very rapidly because the 4-Cell flashlight runs at a higher voltage than the lamp of a 2 or 3-Cell flashlight was designed to handle. For our personal size flashlights and your information, we manufacture a 2-Cell AA Mini Maglite Flashlight, a 2-Cell AAA Mini Maglite Flashlight, and a Single Cell AAA Maglite Solitaire® Flashlight each of which requires its unique lamp... If you use the single-cell Solitaire® lamp in a 2-Cell AA or 2-Cell AAA, the lamp will burn out immediately. Make sure to buy the correct lamp for your flashlight. It’s marked on the packages of our replacement lamps. If you are unsure of which lamp to use in your flashlight do not hesitate to contact us at 1 800-283-5562.

Maglite flashlights are general-purpose flashlights. We have not had them tested or certified as safe for special-purpose uses under any “intrinsically safe” standard or under any of the various “explosion-proof” standards that exist. We do not label our flashlights “explosion proof” or “intrinsically safe” and we do not warrant that they would be safe if put to such a special-purpose use.

When you cannot remove the tail cap to change the batteries, it is probable that the batteries leaked and caused corrosion inside. Mag Instrument does not warrant battery leakage. If the flashlight has been damaged by leakage of batteries, do not return the flashlight to Mag Instrument but determine what brand of the battery caused the damage and follow the battery manufacturer’s instructions about how to make a damage claim.

A Maglite Flashlight’s LED light engine is a permanent component, not a “perishable” or “consumable” item like a battery or an incandescent lamp (either a  vacuum or gas-filled xenon or halogen lamp based on the product selected). In normal use, the LED should last for the life of the owner and should never need to be replaced.

The explanation for these statements is a little complicated. It starts with answering a preliminary question, which is, “How do you define when the useful life of an LED is at an end?” With an incandescent lamp (either a  vacuum or gas-filled xenon or halogen lamp based on the product selected) (filament) lamp, this question is so easy that nobody even asks it: The life of an incandescent lamp is over when it burns out. The “burning out” of an incandescent lamp is a sudden, catastrophic, complete failure; there’s no mistaking it when it happens. “Burnout” occurs when the lamp’s filament (typically made of tungsten, a very high-melting but brittle metal), grows so thin and weak that it can’t support its weight, especially if it is jarred. So the filament breaks. When it does, the flashlight can’t complete the electrical circuit that ordinarily would flow through the filament, so if you turn on the flashlight, it does not give any light. When we say that an incandescent lamp is “dead,” what we mean is that its filament has suddenly and catastrophically failed.

But if we ask the same question about an LED – “How do you define when the useful life of an LED is at an end?” – the answer is not nearly that simple because an LED typically does not fail suddenly and catastrophically: There’s no filament to “burn out,” nor is there any other clear, distinct event you can point to and say that the LED is dead. Instead, what typically happens to an LED is that its light output extremely slowly, and extremely gradually, declines with use.

Much of the literature states that in a typical installation, an LED should perform for 50,000 to 100,000 hours before its light output falls to 50% of its initial output. So if we define 50% as the end-of-useful-life point, and if a flashlight is used for 1 hour a week (and even that might be a lot for a typical homeowner, who would use the flashlight sporadically, occasionally and in short episodes), the LED’s “useful life” (as defined above) should be 50,000 to 100,000 weeks – that is, between one and two thousand years. Even if the user is a night watchman whose flashlight is actually on for 4 hours a night, 5 nights a week – which would be a lot — the LED’s “useful life” (as defined above) should be between 1,666 and 3,333 weeks (i.e., between 48 and 96 years).

Also to keep in mind is that the “50%-of-initial-light-output” definition of the “endpoint of an LED’s useful life” is arbitrary, and one can argue that it is much too short: 50% of the initial light output of a high-powered LED flashlight is still a lot of light, and it seems doubtful that a typical user would discard the flashlight at that point (even if he lived long enough to reach that point). For comparison, the widely-followed ANSI/NEMA FL-1 Flashlight Basic Performance Standard (2009), in prescribing how to rate a flashlight’s “Run Time” on a fresh set of batteries, defines the endpoint of the “useful life” of batteries to be the point where light output declines to 10% — not 50% — of initial output. So in the view of the committee that drafted the ANSI Standard, 10%, not 50%, of initial light output is the reasonable point at which to say that the user would likely regard the batteries as no longer fit for use and in need of replacement. If we were to define the end-point for an LED’s “useful life” as 10% rather than 50% of initial light output, then we might need to speak in terms of a “useful life” of centuries rather than years.

Nobody would claim, however, that an LED is completely bulletproof under all conditions. It should go without saying that one who uses his LED flashlight as an impact tool or a fire-poker is looking for trouble. And, for example, if an LED were driven grossly more than its design-rated voltage and/or current, it could fail quickly. Even if an LED were driven somewhat (but not grossly) over its rated voltage and/or current over a long period, that could accelerate the rate at which its light output would decline. Excessive operating temperatures could also threaten the longevity of an LED. Maglite Flashlights, however, are carefully engineered to keep voltage and current within rated specifications when used with batteries of the correct voltage; and means including good, efficient heat-sinking are built in to keep operating temperature within rated bounds.

Given all this, the statement with which we started this discussion is quite reasonable: A Maglite Flashlight’s LED light engine should be seen as a permanent component, not a “perishable” or “consumable” item like a battery or an incandescent lamp; and the user should expect the LED, in normal use, to remain serviceable for his or her entire lifetime, never needing to be replaced.

Flashlight Performance Testing – The ANSI Standard

In 2009, the American National Standards Institute, in cooperation with the National Electrical Manufacturers Association, published a standard called the ANSI/NEMA FL 1-2009 Flashlight Basic Performance Standard. The ANSI Standard has become widely accepted in the portable lighting industry because it affords a practical way to make “apples-to-apples” comparisons among different flashlights.

Although the ANSI Standard is not mandatory, Mag Instrument has chosen to follow it. That is why, on our product packaging, in our product literature, and on the website, we display certain flashlight performance data in the form of an “ANSI Strip,” so called because it uses the officially-designated ANSI logos and reports data taken in the ANSI-prescribed way.

The ANSI Standard defines four basic performance categories and prescribes official logos for displaying results. The following table lists the categories, and each one indicates the unit of measure, the official logo, and the basic meaning of the category:

Light Output versus Beam Distance

Judging from questions and comments we receive, the distinction between Light Output and Beam Distance is a source of some confusion. It is important to understand that these two concepts – Light Output and Beam Distance –deal with quite distinct characteristics that, surprisingly to many people, don’t necessarily go hand in hand. A flashlight can have a very high Light Output (measured in lumens), and yet have a very short Beam Distance (measured in meters). And the opposite can also be true: A flashlight can have a very modest output in lumens and yet can be remarkably effective in lighting up an object very far away.

Why is this possible? Because Light Output is simply a raw measure of the rate at which a light source generates light – i.e., how many photons, how much “luminous flux,” the source generates per second. It tells nothing about how well or poorly that light is gathered and directed. Beam Distance, on the other hand, is a measure of the maximum distance from which an optimally focused flashlight will cast a useful amount of light on a target. The ANSI Standard effectively defines a “useful level of light” by prescribing that the Beam Distance is the maximum distance at which the flashlight will produce ¼ lux of light. A quarter of a lux can roughly be described as the light level provided by a full moon in an open field on a clear night. That’s not as bright as day, but it is bright enough to see by – a good, standard, working definition of a “useful level of light.” 

So while a flashlight’s Light Output – its “lumen rating” – tells you nothing at all about how good or bad a job the flashlight does at forming a useful beam of light, the flashlight’s “Beam Distance” rating is all about its ability to form light into a useful beam and send it in a useful direction. “Beam Distance” thus strongly correlates to a flashlight’s optical quality; whereas Light Output has nothing whatsoever to do with beam-forming optics. To get a high Light Output score, a flashlight would not even need to have a reflector or lens, at all!

Optics Matter

Since the beginning, Mag Instrument has prided itself on its beam-forming optics — the quality of its precision-designed and precision-crafted reflectors, and the versatility of its spot-to-flood beam focusing mechanism. High-quality optics help a flashlight to direct light in a useful way without excessive power consumption – something that the “brute force” approach of maximizing lumen output cannot do.

Optics and Run Time

High-quality optics can also play a role in slowing battery consumption and prolonging Run Time. As LED technology continues to advance, the number of watts of power consumed per lumen of light generated goes down; but it is still true to say that the more lumens you want, the faster you will consume battery power. So it is still true, and probably always will be true, that excellent beam-forming optics will enhance a flashlight’s ability to deliver useful light while avoiding the need for enormous lumen output and correspondingly fast battery drain.

Maglite flashlights utilize patented Heat-Sink technology to maximize LED performance and life cycle. To achieve maximum performance and extend the life cycle of your flashlight, it's essential to establish a low-thermal-resistance path that allows heat to flow from the LED to the surrounding air. Maglite manufactures its patented heat-sink technology components locally in Ontario, California.

The standard ‘cool white’ LED is designed for maximum brightness.

  • Maglite Solitaire; 3500-6500K, 75CRI
  • AAA Mini Maglite; 3500-6500K, 75CRI
  • AA Mini Maglite; 4500-6500K, 70CRI

The ‘warm white’ LED flashlight is designed for accurate color representation.

  • Maglite Solitaire; 2700-3000K, 90CRI
  • AAA Mini Maglite; 2700-3000K, 90CRI
  • AA Mini Maglite; 2700-3000K, 85CRI

Battery Care

Except for the MAG-TAC® flashlight that runs on lithium CR123 batteries, all of Maglite non-rechargeable LED flashlights operate on AAA, AA, C, or D-cell batteries. All of our published ANSI-standard performance data (Light Output, Beam Distance, Peak Beam Candlepower, and Run-Time) are based on testing with alkaline batteries; and when we ship these flashlights with batteries, the batteries we include with them are alkaline. We do this because the designs of these flashlights are optimized for use with (non-rechargeable) alkaline batteries.

Alkaline AAA, AA, C, and D batteries standardly have a nominal output of 1.5 volts. NiMH rechargeable batteries in these sizes typically have a somewhat lower nominal output (1.2 volts). Also, the discharge curves of NiMH batteries typically differ from those of alkaline batteries – so the two battery types may behave differently under load.

That said, the flashlights will operate with NiMH rechargeables, and the use of NiMH rechargeables will not harm the circuitry nor otherwise damage the flashlights in any way. You should not, however, expect the flashlights’ performance to be consistent with our published ANSI data if they are operated with rechargeable batteries. (For example, ANSI Light Output may be lower, and/or ANSI Run Time may be shorter with rechargeable batteries.) The degree of difference is hard to predict. We have noted variations in the quality of NiMH rechargeable batteries on the market, and if you choose the best-quality NiMH batteries you might find that any performance shortfall is, for your purposes, not meaningful.

Bottom line, if you are willing to tolerate a possibly significant decline in flashlight performance, there is no reason you can’t substitute rechargeable NiMH batteries for (non-rechargeable) alkalines.

Yes, unfortunately, they can.

All alkaline batteries are filled with a caustic material that can damage (corrode) any device, including a flashlight if it escapes from the battery cell. Given the limitations of alkaline battery technology, there is always some risk that a battery might leak under some conditions. There are several specific reasons why this might happen. One is a defect in the battery or physical damage to it. Another reason has to do with the fact that all alkaline batteries have a self-discharge rate, causing them to gradually weaken and die even if they are in a package on a shelf, or in a device that is not used. Leaving dead batteries inside a device can cause battery leakage and result in corrosion damage. Putting new batteries together with old batteries, and/or with batteries of a different type, can also cause rapid discharge, pressure buildup, and leakage. And misuse of the batteries (e.g., by attempting to recharge batteries not designed to be recharged) can also cause leakage that can damage or destroy the flashlight.

When this happens, it probably means that the batteries have leaked and are stuck inside the barrel. Oftentimes, batteries will swell before leaking, causing them to get stuck inside the barrel. Mag Instrument does not warrant battery leakage. If the flashlight has been damaged by leakage of batteries, do not return the flashlight to Mag Instrument but determine what brand of the battery caused the damage and follow the battery manufacturer’s instructions about how to make a damage claim.

Yes, just follow these simple rules:

  • Never leave dead or weak batteries in a flashlight, as they are the ones most likely to leak.
  • It is good practice to replace your entire set of batteries at least once a year, even if the batteries still seem to be functioning normally.
  • When your batteries get low (which you can generally tell by noticing that your flashlight is less bright than it used to be, or goes from bright to dim shortly after it is turned on), replace the batteries – and be sure to replace the entire set at the same time, with freshly-dated batteries that are all of the same brand and the same type.
  • Stick to premium brands of alkaline batteries
  • Never mix old and new batteries.
  • Never mix different brands or types of batteries (e.g., don’t mix alkaline batteries with carbon-zinc or lithium batteries)
  • Never try to recharge batteries that are not designed to be recharged.
  • Carefully inspect your batteries before inserting them into your flashlight, and make sure all batteries are inserted correctly (with the + and – terminals oriented as indicated for the device). Inspect your batteries at least once a month while they are in service.
  • Inspect your batteries immediately after the flashlight has been dropped or otherwise has suffered a hard impact.
  • Immediately remove from service any battery that is found to be leaking or swelling, or that shows signs of damage to its casing or terminals – e.g., denting, crushing, or puncture.
  • Remove from service any battery found to be past its marked expiration date.
  • When removing and replacing a damaged or date-expired battery, replace all other batteries in the same set at the same time, even if they appear undamaged and are not date-expired. (Again, the idea is to never mix old and new batteries.)
  • Importantly, when your flashlight is to be stored for a month or longer, or when you otherwise expect to use it less than once a month, you should remove the batteries and store them separately – not inside the flashlight.

Given the limits of alkaline-battery technology, the unfortunate fact is that there’s no completely foolproof way to prevent corrosion damage from alkaline battery leakage. But if you follow the simple rules above, you can minimize the possibility that batteries will leak inside your flashlight.

Visual signs of battery leakage and crusty deposits (corrosion) inside your flashlight are a sign of leakage and damage, and if the flashlight is non-functional, this corrosion damage is likely the cause.

It sometimes happens that batteries become stuck inside the barrel and are hard to remove. If this happens, it likely means that the batteries have leaked and swelled up, and if the flashlight is non-functional, corrosion damage from the leaking batteries is almost certainly the cause.

It also sometimes happens that the tail cap becomes stuck on the flashlight and is difficult to unscrew. When this happens (and there is no evidence of barrel crushing or denting), the cause likely is that a battery leaked and produced corrosion that involved the tail cap threads, seizing of the tail cap onto the flashlight’s barrel.

In any of these situations, the likely cause is alkaline battery leak damage.

No. Battery exhaustion, battery leakage, and flashlight damage caused by battery leakage are all specifically excluded from your warranty. You may, however, be able to get help from the battery manufacturer if a battery leak damages your flashlight.

Because our warranty excludes battery-leak damage, you should NOT take or send the flashlight to Mag Instrument’s Warranty Service Department.

What you CAN do is contact the battery manufacturer to see if it has a program to repair or replace your leak-damaged flashlight.

Every reputable alkaline battery manufacturer has some form of device damage policy under which you may be eligible to have your flashlight repaired or replaced if it has been damaged by leakage of alkaline batteries that came from that manufacturer.

(NOTE: It is good practice to write down and remember the brand name of any batteries you put in the flashlight. If leak damage does occur, it is sometimes difficult or impossible to get the batteries out of the barrel to see what brand they are.)

Different battery makers may call their device damage policies by different names, and the exact terms may differ from one maker to another and may change over time. Some of the policies may have special requirements, so it may be important to contact the battery manufacturer without delay if you discover battery leak damage. And do not discard the flashlight or the batteries before finding out whether the battery manufacturer requires you to submit them as proof of claim.

You should communicate with the battery manufacturer before you send them the damaged flashlight and should confirm exactly what their device damage claim eligibility requirements and procedures are.

Information can typically be found on the battery manufacturer’s website, and/or on its retail packaging for batteries, and/or via a customer-service phone number appearing on its website or the retail package.

For your convenience, we provide the following website links and contact numbers through which you can get more information concerning battery-leak-damage policies and procedures of various battery manufacturers.

Duracell® –


Support Team 1-800-551-2355

Energizer® –


Customer Service 1-800-383-7323

Ray-O-Vac® –


Customer Service 1-800-891-6091 or 1-800-237-7000

Please understand that the battery manufacturers are companies separate and independent of Mag Instrument. Mag Instrument did not create, does not control, and cannot be responsible for the terms or operation of battery manufacturers’ device damage policies and practices. The above battery manufacturer contact information, current as of late September 2016, is provided to you as a courtesy but is, of course, subject to change by the battery manufacturer.

Rechargeable Batteries

  • The ML150LR/LRS will indicate that the battery needs to be recharged by rapidly dimming the light output (or dimming followed by light shutting off).

  • If the flashlight is used infrequently, the battery should be recharged a minimum of every three months (regardless if no dimming is observed).

  • Additionally, If the light is going to be in storage or not used for three months or more, the battery should be charged and then removed from the light and stored in a safe place.
  • Before initial use, user should fully charge the battery with the provided USB cable.

  • A full charge may take up to 6 hours for first charge.

  • When the USB cable is plugged in, the Green lights come on for a second, then start blinking, if not, then it could be a bad battery and it should be replaced.
  • The MagCharger Power Bank is NOT intended to fit INSIDE the MAG-TAC Rechargeable Flashlight.

  • The MagCharger is made to be an external Power Bank that plugs into the MAG-TAC-Rechargeable Charging Cradle.

  • The User must plug the Power Bank into the cradle using the provided USB-C cable and USB-C to MicroB adapter.
  • Not all USB chargers on the market are fully compliant/compatible.

  • The user may have to try a couple of different chargers; either AC/DC wall adapters, or a computer USB port until they find one that works correctly.

  • Chargers that come with any smartphone or the MAG-TAC Rechargeable Flashlight System will work the best.