A good cordless drill can last 10 years or more. Many don’t, and the reason is usually the conditions they winter in. Batteries leak due to freezer nights, moisture, and months of idleness; chucks rust and switches dry up. It gradually gets worse, so most people don’t notice until spring when a pack doesn’t charge or a trigger gets stuck halfway.
Almost all of this can be prevented. Establish a few practices during the late fall, and you’ll be prepared when the weather changes.
Know What Cold Actually Does to Your Tools
The tool body handles cold well. Steel, aluminum, and glass-filled nylon housings are designed for job site use. The weak points are the lithium-ion battery, the electronics, and any areas where moist air can penetrate the bare metal.
Lithium-ion cells lose capacity when cold. If you pack at -10°C (14°F), you can expect about half the pack’s life. That loss will be reversed at warm temperatures, and the capacity will be restored. The danger is charging a cold pack. Damage occurs when you charge a lithium-ion cell below 0°C (32°F); the damage is permanent. Some of the newer and more expensive chargers will detect a cold pack and wait until the pack is warmed up (most major brands will do this); older and budget chargers may not do this.
The second threat is moisture. When the cold tool comes into contact with warm, moist air, condensation forms on all metal surfaces, including the inside of the motor casing. After a few weeks of these cycles, rust will remain on chucks, blade clamps, and battery terminals.
Keep Batteries Above Freezing
Keep the batteries in the garage if there is one if it gets cold. A closet shelf, a basement utility room, or a lidded plastic bin in a laundry room are all solutions. Most manufacturers suggest long-term storage in a cool, dry area, away from heaters and direct sunlight.
Charging level is also significant. If a pack is fully drained, it may take many nights to drop below its safe voltage range over the winter. A pack that is at 100% ages faster than a pack at 95%. If you store packs for more than a month, keep them around 40-60 percent, or two-three bars on a four-bar gauge. Always refer to your manual, as some brands offer different instructions. If not in use, top packs every 2-3 months.
Avoid keeping batteries on the charger over the winter months. Chargers aren’t meant for storage racks, and a packed charger in the cold garage is the sort of scenario you don’t want to discover.
If your batteries must remain in the garage, place them in a closed cabinet on an inside wall. If you take a cold pack indoors to charge, allow it to rest at room temperature for 2-3 hours before charging it.
Control Moisture Before It Reaches Metal
Wash all tools before storing for the season. Use compressed air to clear dust and sawdust from vents, chucks, and battery slots, which can absorb moisture and retain it in the metal. Afterward, wipe exposed steel with a light machine oil or rust-preventive spray. This helps most with saw blades, plane irons, and drill chucks.
In closed storage, put in a desiccant. Silica gel canisters come in a few sizes; small ones cost about $10 to $20 and can be dried in an oven for years to come. Vapor corrosion inhibitor (VCI) emitters are also available. They emit a protective vapor that covers the metal in an enclosed area; a single emitter usually protects a cabinet for one year.
The digital hygrometer costs about $10 and will let you know if you are making progress. Try to keep RH below 50 percent. When parking a car in the garage, keep in mind that humidity can increase dramatically overnight since melting snow and slush from the tires can enter the garage. If so, position tools as far away from the parking bay as possible.
Do not use a plastic sheet to drape tools. If you place plastic on cold metal, condensation will form on the plastic’s surface, which is worse than leaving the tool uncovered.
Get Tools Off the Floor and Behind Closed Doors
Most garages have the coldest, dampest floor surface: the concrete. Exterior walls are the second most popular item. Store them in closed cabinets mounted on the inside wall, at least 30 cm (12 inches) above the floor.
Blow-molded cases and soft bags can trap moisture, but manufacturer-made hard cases can be used. Store tools in cases, add a small desiccant to each case, and keep them on a shelf, not on the concrete floor.
While the year is open, open pegboard and slat wall systems are convenient. Enclosed storage, however, is a much better choice for winter, when a closed door minimizes temperature and humidity fluctuations that lead to condensation.
Organize Small Parts and Accessories
Drill bits, driver bits, saw blades, and fasteners tend to rust faster than the tools they belong to. Many bits come with only a thin black oxide layer, and loose screws in a coffee can offer no protection. These little items can be stored in a drawer, with each type in its own compartment, and the drawers fit securely shut. Metal parts cabinets and drawers are suitable for this job. You can sort bits by type and size, label drawers, and place a small desiccant pouch in drawers with bits most likely to rust. In the spring, you don’t need to spend 20 minutes looking for a 6 mm masonry bit.
A Pre-Winter Checklist
Work through this list in late fall (before the first hard frost):
- Charge batteries to 40-60% and bring the battery packs indoors.
- Unplug chargers and keep them in a dry place.
- Blow out dust from all tools and wipe metal parts with light oil.
- Examine battery terminals and use a dry brush to remove corrosion.
- Put tools away from outside walls and floor.
- Add desiccant or VCI emitters in closed cabinets and cases.
- Install a hygrometer in the garage and read it every couple of weeks.
- Sort bits, blades, and fasteners into closed, labeled drawers.
Bringing Tools Back Into Service
When the weather warms up, don’t grab a tool from the cabinet and go straight to work. Let cold tools reach room temperature first, so condensation can evaporate before the motor runs. Check the battery terminals and chuck for rust. Charge each pack fully and watch the charger lights. A pack that shows a fault code or won’t take a charge should be recycled rather than forced.
Finally, run each tool without a load for a few seconds. Listen for grinding, and check that the trigger and the forward/reverse switch move freely. A tool that passes these checks is ready for another season.
