Ryobi P104 18V Replacement Battery 3000mAh Li-ion
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Ryobi P104 18V Replacement Battery 3000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Ryobi P104 18V Replacement Battery 3000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
3000mAh
Ryobi ZRP813 Series — 18V Li-ion Replacement Battery (P104)
This is an 18V 3000mAh Li-ion battery that replaces the Ryobi P104 and a wide range of compatible OEM part numbers including P102, P103, P107, P108, and BPL1820. It fits the Ryobi ZRP813 compact drill-driver and over 150 additional 18V ONE+ platform tools. Voltage and connector are matched to the original Ryobi 18V ONE+ interface.
- Ryobi 18V ONE+ platform fit: All models in this family share the same 18V rail, physical slide-in connector, and BMS communication protocol. One battery pack works across the entire ONE+ range without adapters or rewiring.
- Bench tested on actual hardware: We ran this pack on a ZRP813 drill-driver through repeated trigger cycles including full-torque fastening runs. The BMS held stable across high-inrush start events and did not trip under normal clutch-load sequences. Cell voltage after discharge settled consistently above 15V at rest.
- First-use conditioning on the ZRP813: 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 draw and set overcurrent thresholds before you push into full-speed fastening or driving tasks.
BMS cutoff on ZRP813 motor-start inrush surge
When you pull the trigger on a drill-driver, the motor draws a spike of current before it reaches running speed — this is inrush current. On a new or recently stored pack, the BMS overcurrent threshold may not yet reflect the ZRP813's specific motor signature. If the BMS reads that spike as a fault, it cuts power before the motor finishes starting. Running two break-in cycles at half load lets the BMS log the inrush profile and adjust its trip threshold accordingly.
Charger showing red and refusing to accept a new pack from storage
If the pack has sat unused for several months, individual cell voltages can drop below the charger's minimum acceptance threshold — typically around 2.5V per cell on 18V Li-ion packs. The charger reads this as a fault and blinks red rather than starting a charge cycle. To recover the pack, place it in the charger and leave it connected for 15–20 minutes — most Ryobi chargers include a trickle pre-charge mode that slowly raises cell voltage until the main charge cycle can begin. If the charger still does not progress after 30 minutes, check that each cell group is reading at least 2.5V before attempting further recovery.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 ZRP813 cuts out the instant I pull the trigger hard — is the battery faulty?
This is a BMS overcurrent trip, not a failed cell. The motor-start inrush on a drill-driver is a brief current spike that can exceed the BMS protection threshold on a new or cold pack. Run two light-load cycles first — half-speed, low-torque drilling — so the BMS can log the inrush signature before you go to full torque. After that, trigger-pull cutouts on startup should stop.
The drill feels weak and bogs down under load even with a fully charged battery — what's happening?
This points to voltage sag, where the battery's output voltage drops under load due to rising internal resistance at the rail contacts or inside aged cells. Check the slide-in contact points on both the battery and the tool for corrosion or debris — a dirty contact adds resistance and amplifies sag. Clean the contacts with isopropyl alcohol and a dry brush, then retest under load. If the tool still bogs at full charge, measure the pack voltage under load — a healthy 18V pack should hold above 16V during a moderate drilling run.
The battery drains noticeably faster after a few months of use — is that normal or is something wrong?
Capacity fade this early usually comes from repeated shallow cycling — consistently charging from 60–80% back to 100% rather than running the pack down further before recharging. Li-ion cells in power tool packs respond better to fuller discharge cycles. Run the pack down to the tool's low-voltage cutoff before recharging, and do this consistently for the next three to four cycles. This won't restore cells that have genuinely degraded, but it recalibrates the BMS state-of-charge tracking and often recovers apparent capacity that was simply miscounted.
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