Symptoms
- Battery is new out of the box and won't charge fully
- Charger shows done quickly but tool dies fast
- Battery arrived from an online order and behaves oddly
- Charging light never progresses normally
Likely causes
- CommonBattery needs an initial full charge cycle before performing normallySome new lithium-ion packs benefit from one full, uninterrupted charge before first heavy use.
- PossibleManufacturing defect in the new batteryEven new products occasionally have a defective unit.
- PossibleCharger and battery mismatch (wrong charger used)Using an incompatible charger, even if it physically fits, can cause charging problems.
- PossibleCounterfeit or third-party battery not properly matched to the toolOff-brand batteries sometimes have compatibility or quality issues.
- Less commonBattery was already old stock and partially degraded before purchaseBatteries can lose some capacity sitting on a shelf for a long time before sale.
What to do
- Give the new battery one full, uninterrupted charge cycle before judging its performance.
- Confirm you're using the charger that came with it or a manufacturer-approved charger for that exact battery line.
- Test the battery's runtime on a simple task and compare to the manufacturer's stated specifications.
- Check the battery and packaging for authenticity if it was purchased from a third-party seller, since counterfeits are common online.
- Keep the receipt and packaging, since a defective new battery is typically covered under warranty or return policy.
- Contact the retailer or manufacturer for a replacement if the battery clearly underperforms after a proper first charge.
Tools and parts
Manufacturer-original replacement batterySearch: “genuine OEM drill battery replacement”
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.