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Sharp EC-A1R-P 18V Replacement Battery BY-5SB 2000mAh

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New arrival
From $72.99 USD $89.99
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Fits Sharp EC-A1R-P and EC-A1RX-N cordless vacuums; replaces OEM part BY-5SB.
18V, 2000mAh lithium-ion delivers the voltage and capacity for sustained motor performance on carpet and hard floors.
Slide-lock connector seats into the vacuum's battery slot with a quarter-turn lock — verify the tab aligns flush before release.
We bench-tested the BY-5SB on an EC-A1R-P motor load; BMS accepted the pack on first insertion with no fault delay.
Do not leave this vacuum on the charging dock permanently — continuous dock charge causes capacity fade; remove the battery when full.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

Disclaimer

⚠️ 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

18V

Amp

2000mAh

Sharp EC-A1R-P Series — 18V Li-ion Replacement Battery (BY-5SB)

This is an 18V 2000mAh lithium-ion replacement battery for the Sharp EC-A1R-P and related cordless stick vacuum models. It replaces OEM part numbers BY-5SB, BY-5SA, BY-5SBTW, and BY-5SB25. Use it when the original pack no longer holds enough charge to complete a full cleaning session.

  • EC-A1R and EC-AP500 series compatibility: These models share the same 18V motor rail, battery connector, and BMS handshake protocol. A single cell pack covers the full range — the BMS communication signals are consistent across this vacuum platform.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the EC-A1R platform. The BMS negotiated correctly with the charger on first connection, and overcurrent cutoff triggered as expected under a simulated motor-stall condition.
  • Dock charging habit on Sharp stick vacuums: Do not leave this vacuum on the charging dock permanently. These vacuums trickle-charge when docked continuously, and that sustained low-current charge degrades cell capacity faster than normal cycling. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the BMS is comfortable sustaining — often caused by a partially blocked filter, not a weak battery. Restricted airflow forces the motor to work harder, pulling current spikes that the BMS interprets as an overload. The result is voltage sag at the motor, which reads as weak suction even though the cell still has capacity. Clean or replace the filter first, then test suction again before assuming the battery is at fault.

Motor cutting out mid-clean and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked nozzle, clogged filter, heavy carpet fibres — the motor stalls briefly and draws a current spike. The BMS cuts power to protect the cells, then resets once current normalises. Clear any blockage, check the filter, and resume use. If the cutout keeps happening on an open floor with a clean filter, charge the pack to full (18V at rest) and retest — a low cell may be triggering the threshold early.

Compatible Models

EC-A1R-P EC-A1R-Y EC-A1RX-N EC-AP500-P EC-AP500-Y EC-AP700-N EC-AR2S-P EC-AR2S-V EC-AR2SX-N EC-AS500-P EC-AS500-Y EC-AS700-N EC-SX200-A EC-SX200-N EC-SX200-R EC-SX210-A EC-SX210-P EC-SX310-N EC-SX310-R EC-SX320-A EC-SX320-R EC-SX520-P EC-SX520-Y EC-SX530-N EC-SX530-P EC-A1R EC-A1RX EC-A2XE6 EC-AH2R EC-AH5 EC-AH50S EC-AP500 EC-AP700 EC-AR20BK EC-AR2S EC-AR2SX EC-AR3S EC-AR3SX EC-AR5 EC-AR5X EC-AS500 EC-AS510 EC-AS700 EC-AS710 EC-FR5 EC-SX20 EC-SX200 EC-SX210 EC-SX310 EC-SX320 EC-SX520 EC-SX530 EC-VR3S EC-VR3SX EC-A1RCN-P EC-A1RCN-Y EC-A1R-P-Y EC-AR7-N EC-AR7-P EC-AR8-B EC-AR8-W EC-AR9-B EC-AR9-W EC-FR7-B EC-FR9-B EC-KH7X-N EC-KH9X-T EC-KR1-B

Replaces Part Numbers

BY-5SB BY-5SA BY-5SBTW BY-5SB25

Technical Specifications

Voltage18V
Amp Hours2000mAh
Capacity2000mAh
Rate36Wh
Net Weight304.6g /10.74 oz
Gross Weight484.6g /17.09 oz
Approximate Weight484.6g /17.09 oz
Dimension 106.15 x 81.12 x 36.90mm

Product Highlights

  • Brand: Sharp
  • 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 Sharp cordless vacuum loses suction well before the battery light shows it's low — is this a battery problem or something else?

Usually it's not the battery first. A partially blocked filter makes the motor draw more current than rated, which causes voltage sag at the motor — suction drops even though the cells still hold charge. Remove and clean the filter, then test again. If suction recovers, the filter was the cause; if it doesn't, charge the pack fully and retest before replacing anything.

The vacuum motor cuts out for a few seconds during cleaning, then restarts on its own — what's happening?

That's the BMS tripping an overcurrent cutoff. It happens when the motor stalls against a blockage or dense carpet pile, pulling a current spike the BMS won't sustain. The pack shuts output, then resets once current drops back to normal. Check the nozzle for blockages and clean the filter — if it still trips on a clear floor with a clean filter, charge the pack to full and check that resting voltage reads at or above 18V before suspecting a faulty cell.

The replacement battery charges fine but doesn't seem to last as long as the original did when it was new — what causes that?

Capacity fade on Sharp stick vacuums is most often caused by leaving the pack on the dock between uses. Continuous dock charging applies a low trickle current indefinitely, which degrades lithium cells faster than regular charge-and-use cycles. With this replacement pack, charge to full and pull it from the dock — don't leave it seated overnight or between sessions. After three or four proper charge cycles, capacity should stabilise at rated output.

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