Plug the charger into a wall outlet, then slide the battery into the charging slot until it clicks

DeWalt batteries charge in a two-step process: the charger goes into the wall, and the battery goes into the charger. Most DeWalt chargers have a single slot where you slide the battery in horizontally until you hear or feel a click. A light on the charger will turn on — usually red or amber — to show charging is happening. When the light turns green, the battery is fully charged and you can remove it.

The time it takes depends on the battery size and the charger model. A small 1.3 Ah battery might charge in 30 minutes with a fast charger, while a larger 5.0 Ah battery can take two to three hours. Check the label on your specific charger and battery to see the rated charge time — it varies by model.

Key Takeaways

  • DeWalt chargers plug into standard 120-volt wall outlets, and batteries slide in horizontally until they click into place.
  • A red or amber light means the battery is charging; a green light means it is fully charged and ready to use.
  • Charge time ranges from 30 minutes to three hours depending on battery size and charger type — check your charger's label for the exact time.
  • Batteries can overheat if charged in direct sunlight or in very hot rooms; charge them in a cool, dry location away from moisture.
  • If the charger does not light up or the battery does not click in, the battery may be damaged or the charger may need a power outlet test.

Where to charge your battery safely

Charge your DeWalt battery indoors in a cool, dry place — a garage, workshop, or basement works well. Avoid direct sunlight, damp areas, and spaces where the temperature stays above 104°F (40°C). Heat slows charging and can damage the battery's internal cells over time.

Do not charge the battery in a car trunk, a shed without ventilation, or anywhere it might get wet. If the battery gets wet, let it dry completely before charging. Keep the charger away from metal objects, sawdust, and other debris that could fall into the charging slot.

What the charger lights mean

Most DeWalt chargers use a straightforward light system to tell you what is happening. A red or amber light means the battery is actively charging. This is normal and expected. A green light means the battery is fully charged and you can unplug it and use it.

Some chargers have a blinking red light, which usually means the battery is too hot or too cold to charge safely. If this happens, move the charger to a room-temperature location and wait 15 to 30 minutes, then try again. If the light does not change, the battery may be damaged and you should stop trying to charge it.

If the charger does not light up at all, check that the outlet itself works by plugging in a lamp or phone charger. If the outlet is dead, try a different outlet. If other outlets work but the DeWalt charger still does not light up, the charger itself may be faulty.

How often to charge and when not to overcharge

Charge your battery when it runs out of power during use, not on a schedule. You do not need to charge it every night if you only used it for a few minutes. DeWalt chargers have built-in protection that stops charging once the battery is full, so leaving a fully charged battery in the charger overnight will not damage it — but it is not necessary and wastes electricity.

If you use your battery every day, charge it at the end of the workday so it is ready the next morning. If you use it only occasionally, charge it before you need it rather than keeping it plugged in constantly. Batteries last longer when they are used regularly and stored at a partial charge rather than always kept at 100 percent.

Troubleshooting a battery that will not charge

If you slide the battery in and nothing happens, first check that the outlet works. Plug a lamp into the same outlet — if the lamp does not turn on, the outlet is dead and you need to use a different one. If the outlet works but the charger still does not light up, the charger may be broken and you will need to replace it.

If the charger lights up but the battery does not click in all the way, the battery contacts may be dirty. Remove the battery and look at the metal contacts on the bottom. Wipe them gently with a dry cloth to remove dust or corrosion, then try sliding the battery in again. If it still does not click, the battery or charger slot may be damaged.

If the charger shows a blinking red light and does not change after 30 minutes in a cool room, the battery may have an internal fault. Stop trying to charge it and contact DeWalt support or take it to a retailer that sells DeWalt tools — they can test it or replace it under warranty if it is still covered.

Charging different DeWalt battery types

DeWalt makes several battery types, and most modern chargers work with multiple types. The most common are 20-volt lithium-ion batteries, which are used in most cordless drills, saws, and impact drivers. These charge in the standard way described above.

If you have an older 18-volt NiCd or NiMH battery (nickel-cadmium or nickel-metal hydride), it may need a different charger. Check the label on your battery to see the voltage and chemistry type. If your charger does not have a slot that fits your battery, you have the wrong charger for that battery type and will need to buy the correct one.

Some DeWalt chargers are dual-voltage and can charge both 20-volt and 60-volt batteries. If you have multiple battery types, check your charger's label to see which ones it supports. Using the wrong charger can damage the battery or the charger.

How to store a charged battery between uses

Once the battery is fully charged, you can leave it in the charger or remove it and store it separately — both are safe. If you store it separately, keep it in a cool, dry place away from metal objects that could short the contacts. A plastic storage case or a shelf in a garage works well.

If you will not use the battery for more than a month, remove it from the charger and store it in a cool location. Lithium-ion batteries hold their charge for months without use, so you can charge it, store it, and use it weeks later without problems. Before using a stored battery, check that it still has power by looking at the charge indicator on the battery itself — most DeWalt batteries have a small button you press to see how much charge is left.

Frequently Asked Questions

Can I charge a DeWalt battery in the cold?

Most DeWalt chargers will not charge a battery if it is below 32°F (0°C). If the battery is cold, bring it indoors and let it warm to room temperature before charging. Charging a cold battery can damage it permanently.

Is it bad to leave a fully charged battery in the charger?

No. DeWalt chargers have built-in protection that stops charging once the battery is full, so it will not overcharge. However, there is no benefit to leaving it plugged in, and it uses a small amount of electricity, so removing it when it is done is the better habit.

Why does my battery get hot while charging?

Some heat during charging is normal, especially with larger batteries or fast chargers. If the battery is too hot to touch, unplug the charger and let it cool for 30 minutes in a room-temperature location. If it gets hot every time you charge it, the battery may be failing and should be tested or replaced.

Can I use a different brand charger with my DeWalt battery?

No. DeWalt batteries are designed to work only with DeWalt chargers. Using a different brand charger can damage the battery or create a safety hazard. Always use the charger that came with your battery or buy a replacement DeWalt charger.

How long do DeWalt batteries last before they need to be replaced?

Lithium-ion batteries typically last 300 to 500 charge cycles, which is roughly three to five years of regular use. After that, the battery will hold less charge and may not power your tools as long. When this happens, you will need to buy a replacement battery.