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Lenovo 11J8604 ThinkPad Replacement Battery 10.8V 5200mAh

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From $173.99 USD $214.99
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Fits Lenovo ThinkPad Edge E430, E435, E530, E535 laptops; replaces OEM battery 11J8604.
10.8V, 5200mAh lithium-ion delivers full charge cycles for all-day mobile computing on these business ultraportables.
Connector slides into slot with keyed orientation; locking tab seats flush against chassis release lever.
We bench-tested the pack through five full charge cycles; BMS accepted input at 2A with no early cutoff or thermal throttle.
On first install, power the laptop fully off before inserting this cell — the ThinkPad firmware recalibrates voltage thresholds at cold boot, preventing false low-battery warnings during your first session.
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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

10.8V

Amp

5200mAh

Lenovo ThinkPad Edge E430 / E530 Series — 10.8V Li-ion Replacement Battery

This is a 10.8V, 5200mAh (56.16Wh) lithium-ion battery for the Lenovo ThinkPad Edge E430, E435, E530, and E535 laptops. It fits the OEM references 11J8604 and ASM 11J8645. Cell capacity matches the original specification exactly — no upselling, no inflated numbers.

  • E430 / E435 / E530 / E535 platform fit: These four models share the same battery bay geometry, connector pinout, and BMS communication protocol. Lenovo used a unified power rail across this Edge generation, so one pack covers all four variants without adaptation.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a ThinkPad Edge E530 chassis. The BMS handshake completed cleanly, charge state reported correctly in Lenovo Vantage, and the pack held voltage under sustained CPU load without dropout.
  • ThinkPad battery validation cycle: After fitting, run Lenovo's built-in battery gauge reset through Vantage or the BIOS battery settings. The ThinkPad firmware recalibrates its fuel-curve to the new cells during this step — skipping it causes the percentage indicator to read erratically for the first several charge cycles.

Why the E530 reports incorrect battery percentage after a replacement

The ThinkPad Edge platform stores a learned capacity curve in firmware, not just in the battery's onboard controller. When you swap a degraded pack for a new one, the firmware still references old discharge data. This causes the percentage readout to jump or drop unexpectedly, even when the cells are healthy. Running a full discharge-to-cutoff followed by a complete charge through the BIOS battery reset tool clears the old curve and lets the firmware map the new pack's actual capacity.

ThinkPad cuts to reserve warning at 40% then climbs back after reboot

This symptom points to a voltage-threshold mismatch between the new cells and the firmware's low-battery trigger point. New lithium-ion cells have a slightly different open-circuit voltage profile than a worn pack, and the laptop's EC interprets certain discharge knee points as critically low. A reboot clears the cached voltage reading and samples the cells fresh, which explains the percentage recovery. Resolve it permanently by completing one full BIOS-level calibration cycle — discharge the pack to automatic shutdown, then charge uninterrupted to 100% before normal use.

Compatible Models

11J8604 ASM 11J8645

Technical Specifications

Voltage10.8V
Amp Hours5200mAh
Capacity5200mAh
Rate56.16Wh
Net Weight317g /11.18 oz
Gross Weight457g /16.12 oz
Approximate Weight457g /16.12 oz
Dimension 213.00 x 52.20 x 19.00mm

Product Highlights

  • Brand: Lenovo
  • 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

The ThinkPad shuts down and won't restart until I plug in the charger, even though the battery showed 30% a minute ago — what's happening?

Under sustained CPU or GPU load, a degraded or freshly fitted pack can sag below the EC's cutoff threshold momentarily, even when the reported state of charge looks healthy. The firmware treats that voltage dip as a hard low-battery event and shuts the system down protectively. This is a voltage-sag issue, not a capacity issue. Run a full BIOS battery calibration cycle — one complete discharge to shutdown, then a full uninterrupted charge to 100% — so the EC maps the real discharge curve of the new cells.

My E430 won't recognise the new battery at all — the indicator just blinks and Lenovo Vantage shows "no battery detected" — how do I wake it up?

If the pack sat in storage for several months before fitting, the BMS protection circuit can drop into sleep mode when cell voltage falls below the recovery threshold. Remove the AC adapter and the battery, hold the power button for 30 seconds to drain residual board power, then refit the battery and connect AC immediately. This sequence allows the charger's trickle-charge stage to push enough current through to wake the BMS — target at least 10.4V on the pack before the main charge stage kicks in.

During a long video call the battery percentage freezes on screen, then resets to a lower number when I move the laptop — is the pack faulty?

This is a sustained-load voltage dropout causing the fuel gauge to lose sync with actual cell state. Under combined CPU, Wi-Fi, and display draw, the pack voltage dips briefly, the EC pauses its coulomb counting, and the displayed percentage stalls. When load drops — like picking up the laptop — the EC re-samples and corrects the number downward. The pack itself is functioning correctly. Complete one full BIOS calibration cycle to give the EC an accurate discharge map, and the percentage tracking will stabilise under load.

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