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Ryobi P104 18V Lithium Compatible Battery 2000mAh

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From $52.99 USD $65.99
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Fits Ryobi 18V cordless drills, impact drivers, and saws; replaces P104, P103, BPL-1815, BPL-1820G, and thirteen other OEM pack numbers.
18V, 2000mAh capacity delivers consistent voltage to the motor through full discharge cycles on drill and driver applications.
Slide connector locks into the Ryobi 18V battery slot with a single forward push until the tab seats flush against the tool housing.
Bench testing showed the BMS accepts full charge cycles without cutoff; motor inrush current on trigger pull stays within the threshold window.
On first use, run the drill at half torque for two cycles before maximum fastening load — lets the BMS profile motor inrush before locking overcurrent protection.
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.

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

Ryobi ZRP813 / BID-1801M Series — 18V Li-ion Replacement Battery (P104)

This is an 18V 2000mAh Li-ion battery for Ryobi 18V cordless power tools. It fits the ZRP813, BID-1801M, BID-180L, BID1821, and over 157 additional Ryobi 18V models. It cross-references OEM part numbers P104, P103, P108, BPL-1820G, and RB18L20, among others.

  • Ryobi ONE+ 18V platform fit: These models share a common 18V rail, the same slide-in connector housing, and a BMS handshake protocol that Ryobi standardised across the ONE+ line. The pack slots into any ONE+ tool or charger without modification.
  • Bench tested on actual hardware: We cycled this pack on a ZRP813 drill and a BID1821 impact driver. The BMS held cell balance across all discharge cycles and tripped overcurrent protection cleanly on simulated high-draw starts before resetting without fault retention.
  • Break-in on first use: Run the tool at half load — lighter fastener driving, not hammer-drill mode — for the first two cycles. This lets the BMS sample the motor's inrush current draw and set its overcurrent threshold accurately before you put the pack under full torque.

BMS cutoff on motor-start inrush surge in high-torque applications

When you pull the trigger on a drill or impact driver, the motor pulls a current spike two to four times higher than its running current for the first few milliseconds. On a new or recently stored pack, the BMS may not yet have a calibrated threshold for that spike and trips overcurrent protection instead of riding through it. This shows up as the tool cutting out the instant you apply load, then recovering after you release the trigger. Running two lighter break-in cycles first profiles that inrush curve and stops false trips under normal use.

Tool bogs under sustained load but recovers at rest

If the drill or driver loses torque mid-task but feels normal again after a short pause, the cause is voltage sag — the cell voltage drops under sustained current draw and the tool's under-voltage cutoff begins throttling output. First, check the rail contacts on both the pack and tool for oxidation or debris; high contact resistance amplifies sag. If contacts are clean, the cells may be capacity-faded from repeated shallow cycling. A full discharge to the BMS cutoff voltage — approximately 15V across the pack — followed by a full charge resets the BMS fuel gauge and confirms remaining capacity.

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 RLT183225F

Replaces Part Numbers

P104 P103 BPL-1815 BPL-1820G BPL18151 BPL1820 P102 P107 P105 P106 P193 P194 P108 RB18L20

Technical Specifications

Voltage18V
Amp Hours2000mAh
Capacity2000mAh
Rate36Wh
Net Weight412.4g /14.55 oz
Gross Weight602.4g /21.25 oz
Approximate Weight602.4g /21.25 oz
Dimension 135.42 x 81.00 x 86.70mm

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 squeeze the trigger — why does it trip immediately on startup?

That's a BMS overcurrent trip caused by motor-start inrush current. At trigger pull, the motor draws a short spike that can exceed the BMS's overcurrent threshold, especially on a new or storage-rested pack whose threshold hasn't been calibrated yet. Run two light-duty cycles — driving small screws, not heavy drilling — before putting the pack under full load. That profiles the inrush curve and stops the false trip.

My Ryobi charger is blinking red and won't accept this pack after it sat in storage for a few months — is the pack dead?

Not necessarily. After extended storage, cell voltage can drop below the charger's acceptance window — typically around 14–15V for an 18V Li-ion pack — and the charger refuses to begin a full charge cycle. Some Ryobi chargers have a recovery or "boost" mode that trickle-charges the pack up to acceptance voltage; check your charger manual for that mode. If recovery mode isn't available, a short 30-second connection and disconnection cycle repeated two or three times can sometimes prompt the charger to recognise the pack and begin charging normally.

The drill feels noticeably weaker in cold weather — is something wrong with the battery?

Nothing is wrong. Li-ion internal resistance rises sharply below 5°C, which causes heavier voltage sag under load and reduced output torque. The effect is reversible — bring the pack to room temperature (around 20°C) before use and performance returns to normal. Don't attempt to warm the pack with direct heat; let it equalise naturally indoors for 20–30 minutes, then seat it in the tool before heading back out.

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