Rechargeable Headlamps

What makes a rechargeable headlamp different

A rechargeable headlamp carries its own lithium-ion battery and charges it from a USB cable. Black Diamond describes its rechargeables as having an integrated Li-ion battery with a micro USB or USB-C port. That one change moves the whole job from the store to the outlet. You stop managing a drawer of cells and start managing a charging habit.

The table on this page lists headlamps whose maker or Amazon listing states a rechargeable battery, including hybrids that also take AAA cells. Lumens, beam distance, the 10% runtime rule and water ratings work the same as on any headlamp, and the headlamps page explains them. This page is about the battery: how it's built in, how it charges, how it handles cold, and how to keep it alive for years.

What to look at on a rechargeable headlamp

These are the deciding specs for this sub-type, in the order an electrician checks them. (Yes, I check the battery first on everything. Renee's toaster included.)

Battery type: sealed, swappable or hybrid

The power column in the table uses three rechargeable labels:

• Rechargeable built-in: the cell is sealed inside the lamp body
• Rechargeable removable cell: you can pull the battery out and drop in a charged spare
• Hybrid: the maker's rechargeable pack or standard AAA cells, in the same lamp

Here's the trade. Built-in means fewer doors and fewer parts to lose in the leaves. When it's empty, though, the whole lamp is empty, and it stays that way until you find a cable. A removable cell lets you carry a charged spare. A hybrid lets you carry AAA cells you can buy at any gas station on the Turnpike.

Petzl says its hybrid lamps run on either power source without an adapter. Black Diamond's dual-fuel lamps work the same way. They run on the rechargeable pack or on three AAA cells, and the pack is sometimes sold separately, so check the listing.

Charging port and charge indicator

USB-C is the port you want if your phone and power bank already use it. One cable for everything is the whole point. Older lamps use micro USB, which works fine but means one more cord in the bag.

A charge indicator tells you when the lamp is done. One maker's rechargeable headlamp, for example, shows red while charging and green when full. The same maker keys its battery so it only seats one way, and adds a safety circuit that protects against accidental overcharge or discharge. Those are the details I'd look for on any spec sheet, whatever the brand.

Steady brightness and the battery meter

This is the part that surprises people coming from AAA lamps. Petzl says that on its rechargeable pack, brightness generally stays constant over the whole rated burn time. On standard batteries, brightness fades as the cells drain.

That fade is a warning you get for free with AAA cells. You notice the light getting yellow and dim on the walk out. A lamp that holds steady won't give you that hint, so a battery meter earns its place. One maker's dual-fuel lamp, for example, has a built-in meter that shows the percentage of power left. Check the meter before you leave the truck, not when the woods go dark.

Runtime on a charge: the makers don't agree

Runtime is the honest test of a rechargeable, and two makers point in opposite directions.

Petzl says its rechargeable pack has a shorter rated burn time than standard batteries, because the pack discharges differently. Black Diamond's dual-fuel spec sheet shows the reverse on one lamp: 4 hours on high with its rechargeable pack against 2.5 hours on AAA cells. On low, it lists 225 hours against 200.

So there's no rule that a rechargeable always runs longer or shorter. Read the maker's mode-by-mode chart for the battery you'll actually use. Then remember that a rated runtime ends at 10% of starting output under the ANSI/PLATO FL 1 standard, per Streamlight. It doesn't mean the lamp goes dark at that point.

Max output: why rechargeables often lead the table

Black Diamond's headlamp guide says its rechargeable models are typically more powerful than battery-powered alternatives, with more lumens and longer runtimes.

Petzl is more cautious about its hybrids. It says brightness at switch-on differs by about 10% at most between its pack and AAA cells. Either way, "most powerful" only helps if your charge lasts the night. Black Diamond's own advice is to run a bright lamp on a medium setting to stretch the battery.

Water rating and the dust digit

Some rechargeables list an IP rating with two digits instead of IPX. The first digit is for dust and the second is for water. One maker describes one of its rechargeable headlamps as IP64, or dust-tight and water-resistant. The table shows whichever rating the maker states, IPX or IP, so read the last digit when you compare them. Water is the number to read for rain; the dust digit matters if the lamp lives in a truck console with the sawdust and the gum wrappers.

Lockout: protect the only battery you have

On a AAA lamp, a button pressed by a bag strap costs you three cells. On a sealed rechargeable, it costs you the whole lamp until you reach an outlet. That makes a lock mode worth more here than anywhere else. A patented lock on one maker's lamps exists for exactly that bag-strap problem: keeping the light off while it rides in a pack or a pocket.

Practice the lock sequence and its reverse at home, twice, with gloves on, because the button presses differ from maker to maker. Then lock it every time it goes in the bag. Switching the lock off in the dark takes a few seconds. Recharging in the dark takes an outlet you don't have.

Rechargeable, AAA or hybrid: which one fits you

Both makers give the same basic advice in different words.

• Frequent use, power nearby: Black Diamond says a rechargeable suits you if you use your headlamp often and can charge between trips. Petzl points its pack at frequent or intensive use.
• Occasional use or long trips: Petzl points AAA cells at occasional use where a very long burn time matters. Black Diamond suggests dual fuel for remote trips without a place to charge.
• Deer camp: a cabin with an outlet is rechargeable country. A week in a tent without a generator leans hybrid.

My one opinion for this page: rechargeable headlamps are great until the night you forgot to charge them, so pack one with spare batteries. The reason is the steady-brightness point above. A regulated lamp gives you less warning before it quits, and a sealed one can't take a spare. A hybrid with a card of AAA cells, or a second small AAA lamp in the pack, covers both failures. Jess calls this "the Danny redundancy plan." She also borrowed my spare twice last season, so I'm counting that as a win.

Cold weather: the one thing rechargeables don't love

Lithium-ion doesn't like cold, and neither do AAA cells. Petzl's hybrid tech tip puts the line at freezing for both kinds. In the band from freezing down to -4°F, it says you can lose up to half the burn time.

That changes a few habits on a November sit:

• Carry it inside your coat between uses. Body heat is the cheapest battery warmer there is, and Petzl's advice is the same: keep the lamp warm when it's off.
• Start full. A half charge at 20°F is not half a night.
• Don't charge it cold. NFPA's tip sheet and New York's consumer guide both say not to charge lithium-ion batteries below 32°F or above 105°F.

That last one rules out a few camp shortcuts. A pickup cab at 5 a.m. in late November can sit below freezing. The same dashboard in August can bake past 105°F. Charge at room temperature, indoors, the night before. Let a cold lamp warm up before you plug it in.

Charging it safely in the cabin

Lithium-ion batteries store a lot of energy in a small space. Charge them on a hard surface, never on a bed or couch, and stop if a battery swells, gets very hot or smells odd.

The rest is plain habits from the NFPA tip sheet and New York State's consumer guide:

• Use the charging cord that came with the device, or a replacement the maker approves.
• Plug the charger straight into a wall outlet, not a power strip or an overloaded outlet.
• Don't leave it charging unattended or while you sleep, and unplug it once it's full.
• Buy devices listed by a nationally recognized testing laboratory.

For camp without an outlet, Black Diamond suggests an external power bank for recharging in the field. Charge the bank at home, the same way and with the same rules.

Storing it between seasons

A rechargeable headlamp that sits in a drawer from January to October needs a little care first.

• Take the battery out if it's removable. Petzl says to remove standard or rechargeable batteries for long storage.
• Keep it cool and dry, below 77°F per Petzl, and out of direct sunlight per New York's guide.
• Top it up about every 6 months. Petzl says self-discharge is very low on its pack, but it still recommends regular charging.
• Look it over for cracked cases before the season starts.

If a battery is ever bulging, leaking, hissing or giving off a strong odor, stop using it and unplug it. Don't throw lithium-ion batteries in the household trash or recycling bin. New York's guide points to Call2Recycle drop-off locations for small rechargeable batteries in good condition.

Who should skip a rechargeable headlamp

If your camp is a week in a tent with no generator and no power bank, a plain AAA lamp and a pocket of spares is simpler. If you hunt in deep cold and keep the lamp outside your coat, any battery will struggle, but a sealed one gives you no quick fix. And if you'll use a headlamp twice a year, Petzl's own advice leans toward standard batteries for occasional use.

For everyone else, a rechargeable is the light that's always charged, as long as you are the kind of person who charges things. Be that person on Thursday night, not Saturday morning.