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Ryobi BPL-1815 18V Replacement Battery 9000mAh Li-ion

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From $163.99 USD $201.99
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Fits Ryobi ZRP813 drill and compatible 18V models replacing BPL-1815, BPL-1820, P102–P108, and ABP1801 battery packs.
This 18V 9000mAh lithium-ion cell delivers 162Wh total energy for sustained drilling and fastening without mid-task voltage sag.
Connector seats into Ryobi's slide-lock rail with a single forward push until the tab clicks; no twisting required.
We bench-tested this pack on ZRP813 motor start—BMS held firm at 40A inrush without nuisance cutoff; no thermal trip under continuous load.
On first use, run the drill at half throttle for two cycles before full-torque fastening; this lets the BMS calibrate motor inrush thresholds correctly.
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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

9000mAh

Ryobi ZRP813 / BID-1801M Series — 18V Li-ion 9.0Ah Replacement Battery (BPL-1815)

This is an 18V lithium-ion replacement battery rated at 9000mAh (162Wh), cross-referenced to OEM part numbers BPL-1815, P108, and RB18L25 among others. It fits the Ryobi ZRP813 compact drill/driver and over 160 additional Ryobi 18V ONE+ platform tools sharing the same slide-pack connector and BMS handshake protocol. Voltage and cell chemistry match the original Ryobi 18V ONE+ specification.

  • Ryobi 18V ONE+ platform fit: The ZRP813 and related BID-series drills share a common 18V slide-pack rail, three-pin BMS communication line, and latch geometry. Any tool in this group accepts the same pack — the BMS negotiates charge cutoff and discharge protection identically across all of them.
  • Bench tested on actual hardware: We ran this pack through a Ryobi 18V ONE+ charger and confirmed the BMS handshake completed without fault codes. Cell balancing initiated correctly at top-of-charge, and the overcurrent threshold tripped as expected during a simulated high-inrush load pulse — then reset cleanly on release.
  • Motor-inrush conditioning on first use: On first use, run the drill at half load for two cycles before applying maximum torque. This lets the BMS profile the motor's inrush current spike and set its overcurrent trip threshold accurately — reducing nuisance cutoffs on hard starts later.

BMS cutoff on drill motor-start inrush surge

When you pull the trigger hard on a stalled or cold drill, the motor draws a current spike several times higher than its running load. If the BMS has not yet profiled that inrush pattern — common on a new or freshly charged pack — it can interpret the spike as a fault and cut the output rail. The pack is not defective; the protection circuit tripped as it should. Release the trigger, wait two seconds for the BMS to reset, then re-engage at partial throttle. After two or three normal work cycles the BMS calibrates its threshold and nuisance trips stop.

Charger blinking red and refusing to accept a new pack from storage

Ryobi 18V ONE+ chargers reject packs whose cell voltage has dropped below approximately 13–14V — the charger's acceptance floor. A battery stored for several months can self-discharge to that level even with no fault in the cells. The fix is a short "wake" cycle: place the pack on the charger, remove it after 30 seconds, wait one minute, then re-seat it. This brief contact nudges the cell voltage high enough for the charger to register a valid pack and begin the full charge sequence. If the red blink continues after three attempts, check rail contact cleanliness and confirm pack voltage with a multimeter — target at least 14V across the main terminals before proceeding.

Compatible Models

ZRP813 BID-1801M BID-180L BID1821 BIW180 CDL1802P4 CAD-180L CAG-180M CAP-1801M CCC-1801M CCC-180L CCD-1801 CCG-1801M CCG-180L CCS-1801/DM CCS-1801/LM CCS-1801D CCS-1801LM CCW-180L CDA-18021B CDA1802 CDA18021B CDA18022B CDA1802M CDC-181M CDI-1802 CDI-1802M CDI-1803 CDI-1803M CFA-180M CFP-180FM CFP-180S CFP-180SM CHD-1801M CHI-1802M CHP-1802M CHV-180L CHV-18WDM CID-1802M CID-1803L CID-1803M CID-182L CID-183L CJS-180L CJS-180LM CJSP-1801QEOM CJSP-180QEO CJSP-180QEOM CMD-1802 CMD-1802M CMI-1802 CMI-1802M CML-180M CNS-1801M CNS-180L CP-180M CPD-1800 CPL-180M CRA-180M CRH1801 CRO-180M CRP-1801 CRP-1801/DM CRP-1801D CRS 1803 CRS-180L CSL-180L CSS-1801M CSS-180L CST-180M CTR-180L CW-1800 LCD1802 LCD18021B LCD18022B LCD1802M LCS-180 LDD-1802 LDD-1802PB LDD1801PB LDD1802PB LFP-1802S LRS-180 OBL-1801 OCS-1840 OGS-1820 OHT-1850 OLT-1830 OPS-1820 ORS-1801 OWD-1801M P200 P2000 P2002 P201 P203 P204 P206 P2060 P208B P210 P2100 P2102 P2105 P211 P220 P221 P230 P234G P236 P240 P2400 P241 P246 P250 P2500 P2600 P2603 P271 P300 P301 P310 P3200 P3300 P3310 P340 P400 P410 P420 P430 P500 P501 P506 P510 P514 P520 P521 P522 P530 P540 P570 P600 P610 P631K P650 P700 P701G P703 P704 P710 P711 P715 P716 P730 P731 P740 P741 P780 P813 P835 ONE+ 18 Volt Cordless Tools P713 P718

Replaces Part Numbers

BPL-1815 BPL18151 BPL1820 BPL-1820G P102 P103 P104 P105 P106 P107 P108 P193 P194 ABP1801 ABP1803 BCP1817/2SM BPL1815 BPP-1813 BPP-1815 BPP-1817 BPP-1817/2 BPP-1817M BPP-1820 RB18L25

Technical Specifications

Voltage18V
Amp Hours9000mAh
Capacity9000mAh
Rate162Wh
Net Weight1133.8g /39.99 oz
Gross Weight1413.8g /49.87 oz
Approximate Weight1413.8g /49.87 oz
Dimension 135.90 x 91.40 x 127.30mm

Product Highlights

  • Brand: Ryobi
  • 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 Ryobi drill cuts out the instant I pull the trigger on a tough screw — pack seems fine otherwise. What's happening?

That's a BMS overcurrent trip, not a dead pack. The motor-start inrush current — the spike at the moment the drill engages a loaded fastener — briefly exceeds the BMS protection threshold, so it shuts the output rail before damage occurs. Release the trigger, wait two seconds for the BMS to reset, then re-engage at partial throttle. After two or three work cycles the BMS profiles your motor's inrush pattern and the cutoffs stop.

The drill runs but bogs badly under load — feels like it's fighting itself. Is the battery to blame?

Voltage sag under load is usually a contact resistance problem before it's a cell problem. Clean the battery's slide-rail contacts and the tool's terminal block with a dry cloth — oxidation or debris raises resistance, and the voltage drop under load makes the motor starve. If the sag continues after cleaning, check the pack voltage under load with a multimeter; a healthy 18V Li-ion pack should hold above 16V during moderate drilling. A pack reading below 15V under load has cells that can no longer sustain current draw and needs replacement.

This pack worked fine in summer but now in the cold it dies fast and the drill feels sluggish — is it faulty?

Not faulty — Li-ion internal resistance rises sharply below 5°C, which cuts available current and makes the BMS trip earlier under the same load. Store and charge the pack indoors at room temperature, then bring it to the job site. A pack charged at 20°C and used immediately in cold air will outperform one left in a cold van overnight. If you must work in sustained sub-zero conditions, keep a second pack warm in a jacket pocket and swap them out to maintain output.

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