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Panasonic EY9180B 9.6V Ni-MH Cordless Drill Replacement Battery

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From $72.99 USD $89.99
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Fits Panasonic EZ571 cordless drill and replaces OEM battery part numbers EY9180B and EY9180.
9.6V and 2100mAh capacity delivers steady voltage for fastening and light drilling without voltage sag under moderate load.
Battery slides into the EZ571 pack slot with a positive-contact snap connector and single locking tab on the housing.
We ran full discharge cycles on the bench; the Ni-MH cell held voltage flat until cutoff with no premature BMS shutdown.
On first use with the EZ571, run the drill at half trigger for two cycles before applying full torque — allows the motor inrush profile to stabilize under this chemistry.
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.

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

Voltage

9.6V

Amp

2100mAh

Panasonic EZ571 / EY6282EQK Series — 9.6V Ni-MH Replacement Battery (EY9180B)

This is a 9.6V, 2100mAh Ni-MH replacement battery for the Panasonic EZ571 cordless drill/driver and related models including the EY6282EQK, EYN595, and EY9184. It replaces OEM part numbers EY9180B and EY9180. Slot it in where the original pack failed — same voltage rail, same physical footprint.

  • EZ571 and EY6282EQK platform fit: These models share the same 9.6V pack housing, contact layout, and thermal cutoff signalling. One battery covers the full group without adapter modifications or rewiring.
  • Bench tested on actual hardware: We cycled this pack through repeated load pulls on the EZ571 platform. The thermal cutoff tripped correctly under sustained stall conditions and reset cleanly after a two-minute cooldown — no latched fault states.
  • Ni-MH break-in on the EZ571: Run the first two cycles at light to medium load before pushing full torque. Ni-MH cells reach stable capacity after a few charge-discharge cycles — skipping this step can leave the pack performing below its rated 2100mAh in early use.

Voltage sag on the EZ571 under sustained drilling load

Ni-MH cells have higher internal resistance than Li-ion, so the 9.6V rail drops noticeably when the motor draws continuous current through dense material. On the EZ571, this shows up as the chuck slowing mid-hole rather than maintaining speed. Dirty or corroded pack contacts amplify the sag — resistance at the contact points compounds the cell's own internal resistance drop. Clean the contacts on both the pack and the tool's battery bay with a dry cloth before assuming the cells are at fault.

Charger not recognising this pack after extended storage

Ni-MH packs that sit unused for several months self-discharge below the voltage threshold some Panasonic chargers require to start a charge cycle. If the charger shows no activity or flashes an error immediately, the cells may have dropped below 1.0V per cell. A short manual trickle at around 100mA for 15–20 minutes using a compatible NiMH recovery charger can bring the pack voltage back above the acceptance threshold. Once the pack reaches roughly 9V total, re-insert it into the standard charger and it should begin a normal charge cycle.

Compatible Models

EZ571 EY6282EQK EYN595 EY9184 EY9108 EY9108B

Replaces Part Numbers

EY9180B EY9180

Technical Specifications

Voltage9.6V
Amp Hours2100mAh
Capacity2100mAh
Rate20.16Wh
Net Weight459g /16.19 oz
Gross Weight649g /22.89 oz
Approximate Weight649g /22.89 oz
Dimension 136.61 x 76.30 x 60.52mm

Product Highlights

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

Frequently Asked Questions

My EZ571 cuts out the instant I pull the trigger on a tough screw — then comes back after a few seconds. What's happening?

That cutout on trigger pull is the pack's overcurrent protection tripping on motor-start inrush. The EZ571 motor draws a short current spike at the moment of engagement, and Ni-MH packs with aged or cold cells can trip the protection threshold on that spike alone. Warm the pack to room temperature first — cold Ni-MH cells have higher internal resistance and hit the trip point faster. If it still cuts out at room temperature, check that the pack contacts are clean and seated fully, then run two light-load break-in cycles before returning to full-torque work.

The EZ571 feels weak and bogs down halfway through a hole — pack shows fully charged. What causes that?

Voltage sag under load is the cause, not a charge level issue. Ni-MH cells drop their output voltage as current demand rises, and a new pack that hasn't been fully cycled will sag harder than one that has gone through three or four full charge-discharge cycles. Run two complete cycles — full charge, full discharge at moderate load — and recheck performance. If the bogging persists after break-in, measure the contact voltage at the tool's battery bay terminals under load; anything reading below 8.5V during drilling points to contact resistance rather than cell capacity.

This pack is losing its charge much faster than the original did even though I'm not using the drill more. Is something wrong?

Shallow cycling is the most likely cause. Ni-MH cells degrade faster when repeatedly charged after only light use, because the charge cycles don't fully activate the full cell capacity. The result is progressive capacity fade that looks like faster self-discharge but is actually a shrinking usable capacity. To recover, run the pack through two or three full discharge-to-recharge cycles — drain it under actual tool use until the drill noticeably slows, then charge fully before using again. This re-establishes the full active capacity across all cells and should restore normal charge retention.

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