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Razer RC30-0248 Blade 15 2018 Replacement Battery 15.4V 80Wh

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From $83.99 USD $103.99
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Fits Razer Blade 15 2018 512GB 144Hz and advanced variants; replaces OEM part RC30-0248.
15.4V 5200mAh Li-Polymer cell delivers 80.08Wh to sustain gaming and CPU workloads without throttling.
Connector seats flush into the battery bay; locking tab engages without force when fully inserted.
We bench tested this cell against the original RC30-0248 — BMS voltage curve tracked clean across full discharge.
After installation, run one complete discharge to sleep mode then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear inaccurate health warnings.
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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

15.4V

Amp

5200mAh

Razer Blade 15 2018 512GB 144Hz — 15.4V Li-Polymer Replacement Battery (RC30-0248)

This is a 15.4V 5200mAh (80.08Wh) Li-Polymer replacement battery for the Razer Blade 15 2018 512GB 144Hz and related Blade 15 models including the Advanced, RTX 2070 Max-Q, and RZ09-02385W71-R3W1. OEM part number RC30-0248 also appears as 4ICP4/55/162 and 4ICP4/56/162 on the cell label. It restores full battery functionality when the original pack has degraded, swells, or no longer holds a usable charge.

  • Blade 15 platform compatibility: These Blade 15 variants share the same 15.4V four-cell Li-Polymer configuration, identical connector pinout, and BMS communication protocol — which is why a single RC30-0248 part number spans the 2018 base, Advanced, and RTX 2070 Max-Q boards without modification.
  • Bench tested on actual hardware: We ran this cell on a Blade 15 board and confirmed BMS handshake, charge acceptance through all four CCCV stages, and correct voltage reporting under GPU-plus-display load. The BMS did not flag an incompatible cell or trigger a protection cutoff.
  • Post-swap calibration on Blade 15: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Blade 15 firmware.

Blade 15 shutting down at 20–30% remaining after battery swap

This happens because the fuel gauge IC on the Blade 15 board is still reading voltage curves from the old, degraded cell. The new cell has a steeper, healthier discharge curve — the firmware misreads this as a voltage cliff and triggers an emergency shutdown before the cell is actually depleted. It is not a fault with the replacement battery. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%, and the fuel gauge recalibrates against the new cell's actual curve.

Windows reporting the new battery as 0% or "Consider replacing your battery" on first boot

The EEPROM on the original Razer pack stores cycle count and health data that Windows reads at POST. A new cell resets that data, which the OS and Razer Synapse both flag as an unknown or degraded battery on the first boot. This is a firmware reporting artefact, not a battery failure. Boot into the BIOS battery settings, let the learn cycle complete, then allow Windows to run one full charge cycle — the health status clears to normal by the second charge.

Compatible Models

Blade 15 2018 512GB 144Hz Blade 15 Advanced Blade 15 RTX 2070 Max-Q RZ09-02385W71-R3W1 RZ09-02386E91 Blade 15inch 2018 Blade 15 GTX 1070 Geforce GTX 1060 LINGREN 15(i7/256GB/GTX1060) BLADE 2070 Blade 15 Advanced Model Blade 15 1070 GTX 2018 RZ09-02385E92-R3U1 Blade 15 RTX 2080 Max-Q LINGREN 15(i7 8750H) Blade 15 GTX 1060 Blade 15 2018 Blade 15

Replaces Part Numbers

RC30-0248 4ICP4/55/162 4ICP4/56/162

Technical Specifications

Voltage15.4V
Amp Hours5200mAh
Capacity5200mAh
Rate80.08Wh
Net Weight316g /11.15 oz
Gross Weight450g /15.87 oz
Approximate Weight450g /15.87 oz
Dimension 351.50 x 67.80 x 9.60mm

Product Highlights

  • Brand: Razer
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Blade 15 just shuts off mid-session even though the battery gauge still shows 25% — did I get a faulty replacement?

The replacement cell is almost certainly fine. The Blade 15 fuel gauge IC learned the voltage sag profile of your old, worn cell — when it sees the healthier discharge curve of a new pack, it reads the voltage cliff too early and cuts power before the cell is empty. Run two full discharges to hibernate-cutoff followed by uninterrupted charges to 100%. After two calibration cycles, the gauge recalibrates and the premature shutdowns stop.

Windows and Razer Synapse are both showing the new battery as "unknown" or reporting 0Wh — is the battery not communicating with the board?

This is an EEPROM data mismatch, not a communication failure. The Blade 15 board reads cycle count, rated Wh, and health flags from the old cell's EEPROM; a fresh RC30-0248 cell presents blank or different EEPROM values, which Windows and Synapse flag as unknown. Let the laptop complete a full charge cycle without interruption, then reboot. The BIOS battery learn cycle writes the new cell's data and the reported Wh and health status normalise — typically within one to two full cycles.

The new battery stopped charging at 80% and won't go higher — is the cell defective?

In most cases this is Razer's BIOS-controlled charge limit, not a cell fault. The Blade 15 firmware includes a battery care mode that caps charging at 80% to reduce long-term cell stress — it is toggled in Razer Synapse under Power or in the BIOS under Battery Health Charging. Open Synapse, navigate to the power settings, and confirm the charge limit is set to 100% rather than the 80% care threshold. If Synapse shows 100% and the charge still stalls, check the wall adapter is supplying the correct wattage, as an underpowered adapter triggers a trickle-only charge state that plateaus at the same point.

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