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18V Ryobi BPL-1815 Replacement Battery 4500mAh Li-ion

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From $132.99 USD $163.99
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Fits Ryobi ZRP813 and 160+ compatible models; replaces BPL-1815, BPL-1820, P102–P108, ABP1801, and other OEM part numbers listed.
18V lithium-ion pack delivers 4500mAh capacity — supplies sustained current for drills, saws, and impact drivers without voltage sag under mid-load operation.
Slide connector aligns vertically into tool battery slot; locking tab engages at base and releases with downward thumb press for secure seating.
We bench-tested this pack on a ZRP813 drill under progressive load — BMS held steady through motor inrush spikes and thermal cutoff remained dormant at sustained 40A draw.
On first use, run the tool at half throttle for two cycles before maximum torque applications — lets the BMS profile the motor inrush current before locking overcurrent thresholds.
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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

4500mAh

Ryobi ZRP813 / P-Series 18V Li-ion 4500mAh Replacement Battery (BPL-1815)

This is an 18V lithium-ion replacement battery rated at 4500mAh (81Wh), cross-compatible with Ryobi's BPL-1815 and P-Series OEM part numbers. It fits the ZRP813 and over 160 additional Ryobi 18V ONE+ platform tools — drills, circular saws, jigsaws, and reciprocating saws included. The connector footprint and BMS handshake match the original Ryobi slide-mount interface.

  • Ryobi 18V ONE+ platform fit: All tools in this list share the same 18V rail voltage, slide-mount connector, and BMS communication protocol. That shared architecture is why one battery pack works across drills, saws, and multi-tools without adapters or firmware changes.
  • Bench tested on actual hardware: We ran this pack on a ZRP813 drill and a circular saw under sustained load. The BMS held steady through repeated motor-start inrush spikes and did not trip overcurrent protection during normal trigger cycling.
  • Motor inrush conditioning on first use: On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent threshold before you hit maximum demand.

BMS cutoff on drill and saw motor-start inrush surge

When you pull the trigger hard on a saw or high-torque drill, the motor draws a spike of current — often three to five times the steady-state load — in the first milliseconds of startup. A BMS with a tight overcurrent threshold will read that spike as a fault and cut the pack before the blade or bit even reaches speed. This pack's BMS is calibrated to the inrush profile of Ryobi 18V ONE+ motors, so it distinguishes a normal start surge from a genuine short-circuit event. If you still get cutouts on trigger pull, check the rail contacts on the tool — oxidised contacts increase resistance and distort the current signal the BMS reads.

Charger blinks red and won't accept the pack after storage

Ryobi 18V chargers have a minimum acceptance voltage — typically around 13V across the pack. If individual cells self-discharge below that floor during extended storage, the charger rejects the pack entirely and signals with a red blink pattern. The fix is a slow recovery charge: some Ryobi chargers include a "boost" or recovery mode that trickle-charges the cells back above the acceptance threshold before switching to normal charge current. If your charger lacks that mode, a compatible Li-ion pack charger set to 0.5A trickle for 10–15 minutes will usually bring cell voltage back above 13V so the standard charger can take over.

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 Hours4500mAh
Capacity4500mAh
Rate81Wh
Net Weight1133.8g /39.99 oz
Gross Weight1413.8g /49.87 oz
Approximate Weight1413.8g /49.87 oz
Dimension 135.50 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 hard — battery or tool fault?

That's a BMS overcurrent trip, not a tool fault. The motor-start inrush spike on a drill or saw can hit three to five times the running current in the first milliseconds, and if the BMS threshold is set tight it reads that as a short. Check the slide-mount rail contacts on both the tool and the battery first — oxidised contacts raise resistance and make the inrush spike look worse than it is. Clean the contacts with isopropyl alcohol, then try the trigger at half-speed before going full torque.

The battery gets hot and the saw bogs down after about ten minutes of cutting — what's causing it?

Sustained circular saw load generates heat in both the motor windings and the battery cells simultaneously. Once cell temperature climbs past the BMS thermal cutoff threshold, the pack reduces current output to protect the cells — which is what you feel as bogging. The enclosed housing of the Ryobi slide-mount pack traps that heat. Let the pack cool for at least five minutes between extended cuts, and check that the battery housing vents are clear of sawdust.

This pack loses noticeably more charge sitting in the drawer than my old one did — is something wrong?

Li-ion cells self-discharge faster when they're stored fully charged. If you charged this pack to 100% and left it for several weeks, a measurable voltage drop is normal — but if it's draining within days, check that the BMS is not stuck in an active state drawing a small parasitic current. Remove the pack from any tool or charger, let it sit isolated for 48 hours, then measure open-circuit voltage with a multimeter. A healthy 18V Li-ion pack should read between 19.8V and 20.5V after a full charge; if it's below 18V after 48 hours of isolation, the BMS has a drain fault.

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