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Primary (Non-rechargeable) Lithium Batteries

CR123A primary (non-rechargeable) lithium batteries are an advanced battery chemistry that economically out-performs most commonly available battery chemistries under high drain and cold temperature conditions.

Although CR123A lithium batteries were originally designed for high current camera applications, they excel in flashlights where their small size and high power provide unrivaled levels of product performance.  And all this is available at a very attractive price point.  See the battery runtime chart to see how these batteries compare.

Duracell brand batteries are premium batteries.  They provide a superior combination of high current performance and low current capacity.  That means Duracell brand batteries provide top-rated performance at high currents as well as provide the longest run times at lower power settings.

Dead batteries may be safely disposed of in a sanitary land fill.  Check with your local authorities for local disposal requirements.

The CR123A primary batteries provide 3.2V maximum and 2.8V nominal and provide a shelf life of 10 years at room temperature.

Rechargeable Lithium-ion Batteries

Rechargeable lithium-ion batteries provide excellent performance for the EDC-series flashlights.  See the battery runtime chart to see how these batteries compare.

Rechargeable lithium-ion batteries provide less emergency time than primary (non-rechargeable) batteries due to their lower internal resistance.  That means that once your EDC-series flashlight begins to step down to lower brightnesses as the battery is used up, the step-downs will occur more quickly and you will have significantly less time before the light becomes very dim.

Our flashlights are designed to accommodate the higher voltages generated by lithium-ion batteries - up to 4.2V when fully charged.  In addition, our EDC-series flashlights protect the lithium-ion batteries from over-discharge when used as directed.  These two features are unique to our line of flashlights and make using lithium-ion batteries safe and convenient.

Lithium-ion batteries come with different forms of battery protection.  At a minimum, you should always use a battery with short-circuit protection - generally provided by a PTC (automatically resettable fuse).  These batteries will provide the best high power performance.

Some batteries offer an additional level of protection designed to prevent over-discharge.  These batteries contain a circuit which will turn off the battery if the battery is over-discharged.  This circuit protects the battery from damage and must be used with products that do not automatically protect the battery.  When the circuit activates, the battery is turned off to prevent further discharge causing the product to suddenly stop working without warning.  The battery must be recharged to turn it back on.  In general, the design of our EDC-series flashlights prevent the over-discharge circuit from activating in most batteries we have tested.

Batteries that contain over-discharge protection have lower high-power performance than batteries without over-discharge protection due to the added resistance of the protection circuit.

Lithium-ion batteries require special chargers that are designed for the battery being charged.  In general, lithium-ion batteries should never be charged at a rate that exceeds half of their rated capacity and the maximum terminal voltage should never exceed 4.2V.  Do not leave a lithium-ion battery charging for more than 3 hours unless the charger has automatic charge termination built in.