makita xfd131 battery gets really hot and dies fast, is it gonna explode?

Diagnosis

The overheating and rapid discharge of your Makita XFD131 battery are indicative of "internal resistance buildup" or a failing cell within the 18V LXT pack. When a lithium-ion cell degrades or suffers physical damage, it can no longer efficiently store or release energy. Instead, the energy is converted into heat during discharge. If the battery feels hot to the touch specifically near the vents or the base, it means the internal chemistry is unstable, and the battery is struggling to maintain the voltage required to drive the XFD131 motor. This is often caused by "deep discharging" (leaving the battery at 0% for weeks) or using the drill for high-torque applications (like driving 3-inch lag screws) without pausing, which forces the battery to dump current faster than the cells can handle. While these batteries have an integrated Protection Circuit Module (PCM) to prevent a full-scale "thermal runaway" (explosion), a battery that gets hot while idling or under light load is a critical failure. If you smell a sweet, metallic scent or see the plastic casing bulging, the cell membranes have ruptured, and the pack is now a fire hazard.

How to Fix It

Stop using the battery immediately. Do not attempt to "top it off" with a charger, as adding current to an unstable, hot cell can trigger a fire. Follow these steps to safely decommission and test the unit:

1. Safe Cooling: Remove the battery from the XFD131 drill and place it on a non-flammable surface (concrete garage floor or a metal tray) away from curtains, cardboard, or gasoline cans. Let it sit for at least 4 hours until it reaches room temperature.
2. Physical Inspection: Examine the battery casing for "swelling." Lay the battery on a flat table; if it wobbles or the seam along the side is splitting, the cells have expanded. Check the gold-plated terminals for carbon buildup (black soot) or melted plastic, which indicates a short circuit.
3. Terminal Cleaning: Use a cotton swab dipped in 90% isopropyl alcohol to clean the contact points on both the battery and the drill's mounting rail. Ensure no metal shavings or conductive debris are lodged in the battery slots.
4. Voltage Test: If you have a multimeter, set it to DC Voltage. Touch the probes to the positive and negative terminals. A healthy 18V LXT battery should read between 18V and 20V. If it reads below 14V despite being "charged," the pack has a dead cell and must be recycled.
5. Charger Verification: Inspect your DC18RC or DC18NC charger. Ensure the cooling fan is spinning. If the charger is clogged with dust, it may be under-charging the battery, leading to imbalance and heat.

If That Didn't Work

• Replace the Battery Pack: If the battery continues to overheat after a full cooling cycle and cleaning, the internal chemistry is compromised. Replace it with a genuine Makita BL1830 or BL1850 battery. Avoid "knock-off" generic batteries from third-party marketplaces, as they often lack the thermal sensors and PCM boards required to prevent the XFD131 from overheating.
• Check the Drill Motor: The heat might not be the battery, but the drill. If the XFD131 motor brushes are worn or the gearbox is seized, the motor will draw excessive current (amps) from the battery, causing the battery to heat up. Try a different, known-working battery; if that one also gets hot, the fault is in the drill's trigger switch or motor.
• Inspect the Trigger Switch: A "sticky" or partially engaged trigger can cause a partial short or a constant low-level draw that heats the battery. Spray the trigger mechanism with a non-conductive electronic contact cleaner to ensure the switch is snapping fully open and closed.
• Recycle the Pack: Do not throw the overheating battery in the trash. Take it to a dedicated lithium-ion recycling center or a hardware store with a battery take-back program to avoid causing a garbage truck fire.

Heads Up

• Temperature Thresholds: Never charge a battery that feels hot to the touch. The LXT charger has a thermal cutout, but forcing a hot battery into a charger can permanently damage the cell chemistry.
• Storage Voltage: To prevent future failures, do not store your batteries completely empty. Lithium cells prefer to be stored at roughly 50-70% charge for long-term stability.
• Load Management: If you are drilling into dense hardwoods or masonry and the battery feels warm, stop for 60 seconds. Continuous high-amp draw is the fastest way to kill an 18V LXT pack.
• Avoid Extreme Cold: Do not leave your XFD131 and batteries in a freezing truck overnight. Cold temperatures increase internal resistance, which can lead to overheating once you start using the tool.