Most glove box flashlights are dead. Somebody bought one years ago, loaded it with alkaline batteries, and let it cook through a few summers. The night it's finally needed, the switch does nothing and the battery tube is full of white crust.
The best flashlight for a car isn't the brightest one. It's the one that still works after two summers and two winters of being ignored. So pick the battery first and the light second. Here's what holds up, what a roadside stop really asks for, and what we'd keep in the car.
A car is a rough place to store a battery
On a hot day, a closed car parked in the sun can pass 60 °C (140 °F) inside, and the dashboard runs hotter than that. In January the same car sits below freezing all night. Each battery type handles that differently:
- Alkaline. The usual choice and the worst one. Heat and age make alkalines leak, and a leaked cell ruins the light around it. Cold cuts their output hard, too.
- Lithium-ion rechargeables (18650, 21700, 14500, and the cells sealed inside USB-C lights). Heat ages them faster, and it's worst when they sit fully charged. Cold shrinks their capacity until they warm back up. They also shouldn't be charged while they're below freezing.
- Lithium primary AA. This is the non-rechargeable 1.5 V lithium AA sold at any hardware store. These are rated for roughly −40 to 60 °C (−40 to 140 °F), they don't leak the way alkalines do, and they hold their charge for ten years or more.
That settles the main question. The light that lives in the car should run on one AA, and that AA should be a lithium primary.
The light that never leaves the car
Look for three things: a single AA, a magnet in the tail, and a body small enough that it stays in the glove box instead of getting moved to the garage. Two lights we stock fit.
The Fenix E12 V3.0 is the simple one. It runs on one AA, puts out up to 200 lumens with a 78 m (256 ft) beam, and lasts up to 100 hours on Low. The tail is magnetic, so it sticks to steel and leaves both hands free. The tail switch is mechanical, which means no standby drain while it waits. It's IP68 rated, 81.5 mm (3.21 in) long, and 53.9 g (1.90 oz) with a battery. It ships with an alkaline, so swap that for a lithium AA before it goes in the glove box. It's an AA-only light. Don't feed it a 3.7 V 14500.
The Convoy T7 is the floodier one. It takes an AA or a button-top 14500, has a magnetic tailcap, and uses a 60° TIR optic that spreads the light wide, which is what you want for close work like a wheel well. It's 94 mm (3.7 in) long and 46.2 g (1.6 oz). For car duty, load a lithium AA. The USB-C port is there to charge a 14500 inside the light, so never plug it in with an AA installed. If you'd rather carry it every day, switch to a 14500 for more output.
One tip for either light: plenty of hoods and fenders are aluminum or plastic now, and a magnet won't hold on those. Find your steel spots in the driveway, not on the shoulder.
What a roadside stop actually asks for
A flat tire at night isn't a lumens problem. It's three small jobs.
- Light on the work, both hands free. Lug nuts, the jack point, a fuse panel, the dipstick. You need a wide, modest beam that stays where you put it, and a magnetic tail covers most of that. The Wuben G5 goes one better with a magnetic base and a head that rotates 180°, so you can aim it after it's stuck down. If you'd rather wear the light, the Convoy H4 is a right-angle headlamp that comes with its headband. It needs a 21700 cell, sold separately.
- Getting seen. On a dark shoulder, being seen matters more than seeing. Your hazard flashers do most of that work, and a flashing red light stuck to the back of the car adds to it. The NightGlow S11 does this for about $15: magnetic tail, a red flashing mode, USB-C charging, and a glow-in-the-dark body you can find in a dark door pocket.
- Phone power when the car is dead. A dead car battery means dead USB ports. The Wuben E12R is a flashlight and a power bank in one body, so the light you're using on the engine bay can also put some charge back in your phone.
Rechargeable lights in the car: fine, with rules
Most of what we sell is rechargeable, and USB-C lights are great. They just need a little care in a car.
- Keep them out of the sun. Glove box, center console, or door pocket. Never the dash.
- Check the charge on a schedule. A light that has sat for a year may not have much left.
- Don't charge a frozen light. If it's been in a car below 0 °C (32 °F), bring it inside and let it warm up first.
- Better yet, carry it in and out. The rechargeable rides in your pocket or bag. The AA light stays in the car.
The easiest way to follow that last rule is a keychain light, because your keys leave the car when you do. The Nitecore TUBE V2.0 weighs 9.6 g (0.34 oz), ramps from 1 to 55 lumens, and charges over USB-C. Its standby drain is cut to 1 µA, so a charged TUBE stays ready for up to a year. It won't change a tire. It will find the lug wrench.
What to skip
- The 8,000-lumen monster. Great light, wrong job. Close-up work needs flood and runtime, and turbo modes don't give you either for long.
- Loose spare lithium-ion cells in the console. Coins and keys can short them, and the console gets hot. If you carry spares, keep them in a case and take them with you.
- Alkalines left inside anything. If a light came with one, pull it.
- Your phone as the plan. It ties up a hand and burns the battery you need to call for help.
What we'd put in the car
- One AA light with a magnetic tail, loaded with a lithium AA, in the glove box
- One spare lithium AA, left in its packaging
- A magnetic red flasher in the door pocket
- A small light on the keys
- For long trips, a power bank flashlight that comes along and then goes back in the house
Check all of it twice a year when the clocks change. Click each light on, charge anything rechargeable, and look at the batteries. It takes five minutes in the driveway, which is a much better place to find a dead light than the shoulder of a highway at 11 p.m.