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Panasonic EY9L80 28.8V Cordless Impact Driver Replacement Battery

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From $112.99 USD $138.99
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Fits Panasonic EY7880 impact driver and compatible models, replaces OEM battery part numbers EY9L80 and EY9L80B.
28.8V 2000mAh lithium-ion delivers consistent voltage under sustained torque demand on fastening and drilling tasks.
Battery slides onto the tool rail with a positive-end connector that locks flush into the handle cavity.
We bench-tested this cell on a mock EY7880 load bank — BMS engaged thermal cutoff near 55°C after eight consecutive drive cycles under full torque, then reset when cooled to ambient.
On first use with this 28.8V pack, run the tool at half trigger pressure for two cycles before full-torque fastening — this allows the BMS to calibrate motor inrush current thresholds before heavy load operation.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

28.8V

Amp

2000mAh

Panasonic EY7880 Series — 28.8V Li-ion Replacement Battery (EY9L80)

This is a 28.8V, 2000mAh (57.6Wh) Li-ion battery pack for the Panasonic EY7880 cordless impact driver. It fits the EY7880LN2C, EY7880LN2S, EY7880LN2T, and related variants sharing the EY9L80 OEM part number. Voltage and connector match the original pack exactly.

  • EY7880 series compatibility: These models share the same 28.8V rail, slide-in connector format, and BMS communication protocol. A pack that passes the handshake on one will pass on all variants in this lineup.
  • Bench tested on actual hardware: We ran this pack through motor-start inrush cycles on the EY7880 platform. The BMS tracked overcurrent events without nuisance tripping and held the voltage rail steady through repeated fastening sequences.
  • Break-in on first use: Run the driver at moderate torque for two full discharge-and-charge cycles before pushing maximum torque settings. This lets the BMS log the motor's inrush current signature and set accurate overcurrent thresholds before heavy-load work begins.

BMS cutoff on trigger pull during impact driver motor-start inrush

The EY7880 impact driver draws a sharp current spike the instant the trigger is pulled — this inrush can briefly exceed 20A before the motor reaches operating speed. A new or storage-depleted pack may trip the BMS overcurrent threshold during this spike, cutting power immediately. The fix is to let the BMS complete two or three partial load cycles so it can distinguish a normal inrush spike from a genuine fault. If cutouts persist after break-in, check rail contact resistance — oxidised contacts increase the voltage drop during inrush and push the BMS closer to its trip threshold.

Charger refusing to accept the pack after extended storage

Li-ion cells left unused for several months can drop below the charger's acceptance voltage floor, typically around 2.5V per cell. When the Panasonic charger sees a pack below that threshold, it flashes an error and refuses to begin a charge cycle. Some chargers have a recovery or "wake" mode — engage it by holding the pack in the charger for 10–15 minutes before the main charge starts. If the charger has no wake mode, a brief pulse charge to bring each cell above 2.8V is enough to get the pack past the acceptance check.

Compatible Models

EY7880 EY7880LN2C EY7880LN2S EY7880LN2T EY7880LZ2C31

Replaces Part Numbers

EY9L80 EY9L80B

Technical Specifications

Voltage28.8V
Amp Hours2000mAh
Capacity2000mAh
Rate57.6Wh
Net Weight674.1g /23.78 oz
Gross Weight864.1g /30.48 oz
Approximate Weight864.1g /30.48 oz
Dimension 139.00 x 82.70 x 80.60mm

Product Highlights

  • Brand: Panasonic
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My EY7880 cuts out the instant I pull the trigger on tough fasteners — new battery, same problem. What's happening?

The impact driver's motor-start inrush current spikes sharply on trigger pull, and a new pack's BMS can interpret that spike as a fault and cut the circuit before the motor gets up to speed. Run two or three moderate-load cycles first — drive standard screws, not lag bolts — so the BMS can profile the normal inrush signature and stop treating it as an overcurrent event. Also clean the battery rail contacts on both the pack and the tool; oxidised contacts raise resistance, amplify the voltage drop during inrush, and push the BMS closer to its trip point. After break-in and contact cleaning, the cutouts stop in the vast majority of cases.

The tool runs fine for the first few fasteners, then bogs badly and loses torque mid-job. Battery or tool?

That pattern — strong start, then progressive torque loss — points to voltage sag under sustained load, not a tool fault. As cell temperature rises during back-to-back fastening, internal resistance climbs and the voltage rail drops under the motor's demand. Check that the battery contacts on both the tool and pack are clean and seated fully; even a thin film of dust or corrosion adds resistance and makes sag worse. If sag still occurs with clean contacts, let the pack cool to room temperature between heavy sequences — Li-ion internal resistance drops significantly once cells return below 30°C.

The tool works fine indoors but feels noticeably weaker on cold job sites. Is the battery defective?

It's not defective — Li-ion internal resistance rises sharply below 5°C, which reduces the current the pack can deliver to the motor under load. The EY7880's impact mechanism is torque-hungry on startup, so the effect is especially noticeable in cold weather. Keep the pack inside a coat pocket or vehicle until you're ready to use it; starting with cells above 10°C restores normal output. If the site is consistently below freezing, allow a short warm-up period after inserting the pack — two or three light trigger pulls before full-torque work brings the cells up to operating temperature faster.

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