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MaxData ECO 4500 Replacement Battery 10.8V 4400mAh Li-ion

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From $91.99 USD $109.99
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Fits MaxData ECO 4500, ECO 4500A, ECO 4500I, ECO 4500IW; replaces L50-3S4400-S1S5, L50-3S4000-S1P3, L50-3S4000-C1L1, and eight other OEM part numbers.
10.8V, 4400mAh lithium-ion delivers 47.52Wh to restore full portable runtime on the ECO 4500 series.
Connector slides straight in; locking tab seats flush with the battery bay for secure contact every cycle.
We bench-tested charge acceptance on a cold BMS — cell accepted full voltage within first thirty minutes, no initial cutoff.
After installation, run one complete discharge to sleep mode, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warnings that appear after every cell swap.
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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

4400mAh

MaxData ECO 4500 Series — 10.8V Li-ion Replacement Battery (L50-3S4400-S1S5)

This is a 10.8V, 4400mAh (47.52Wh) lithium-ion battery for the MaxData ECO 4500, ECO 4500A, ECO 4500I, and ECO 4500IW laptops. It slots into the same bay as the original cell and uses the same connector and BMS communication protocol. Voltage and capacity match the OEM specification exactly.

  • ECO 4500 series compatibility: All ECO 4500 variants share the same 10.8V three-cell architecture, connector pinout, and BMS handshake protocol — that is why a single cell covers the full model range from standard to IW. The EEPROM embedded in this pack carries the correct chemistry and Wh identifiers for the platform.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the ECO 4500 platform. The BMS negotiated correctly at first insertion, charge current ramped as expected, and the protection circuit tripped cleanly at the low-voltage cutoff without false shutdowns.
  • First-cycle calibration on the ECO 4500: After fitting this battery, run the laptop on battery power until it hibernates at cutoff, then charge uninterrupted to 100% before using it again. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the false health warning that almost always appears after a cell swap.

ECO 4500 shutting down at 20–30% charge remaining

This happens when the laptop's fuel gauge IC has calibrated its cutoff threshold against the old, degraded cell — not the new one. Under full CPU and display load, the voltage on the new cell drops faster than the IC expects, triggering a premature shutdown before the true reserve is exhausted. The fix is a full discharge-to-hibernate followed by a single uninterrupted charge to 100%. After two or three full cycles the fuel gauge IC recalibrates against the new cell's actual voltage curve and the shutdowns stop.

BIOS reporting wrong Wh rating after battery swap

The MaxData ECO 4500 BIOS reads Wh data from the EEPROM embedded in the battery pack, not from a live measurement. If the displayed Wh figure differs from 47.52Wh shown in system information, the BIOS has not yet completed a full learn cycle against the new cell's EEPROM. Run one complete discharge to hibernate cutoff and one full recharge without interruption. After that cycle, the BIOS should read the correct 47.52Wh figure from the pack's EEPROM data.

Compatible Models

ECO 4500 Eco 4500A Eco 4500I Eco 4500IW ECO 4511

Replaces Part Numbers

L50-3S4400-S1S5 L50-3S4000-S1P3 L50-3S4000- C1L1 L50-3S4000-C1S1 L50-3S4000-C1S2 3S4000-G1P3-04 3S4000-C1S3-04 3S4400-XXXX-04 L51-3S4400-S1S5 L51-3S4400-C1L3 L51-3S4000-G1L1 L51-3S4000-S1P1 805N00045 3S4000-G1S2-04 3S4000-S1P3-04 3S4000-S1S3-04 23GL1GF0F-8A WP-UNL50/3

Technical Specifications

Voltage10.8V
Amp Hours4400mAh
Capacity4400mAh
Rate47.52Wh
Net Weight323g /11.39 oz
Gross Weight473g /16.68 oz
Approximate Weight473g /16.68 oz
Dimension 202.00 x 53.50 x 21.50mm

Product Highlights

  • Brand: MaxData
  • 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 MaxData ECO 4500 shows the new battery as "unknown" or 0% in Windows immediately after fitting it — what's wrong?

The fuel gauge IC in the ECO 4500 holds calibration data from the old cell in its memory and cannot immediately map the new cell's voltage curve to a percentage. This is an EEPROM data mismatch, not a faulty battery. Run the laptop on battery until it hibernates at low-voltage cutoff, then charge uninterrupted to 100%. After that full cycle the gauge IC re-maps against the new cell and the percentage reading normalises.

The ECO 4500 stops charging at around 80% and refuses to go higher — is the replacement cell defective?

This is almost always a BIOS-controlled charge limit, not a cell fault. Some MaxData ECO 4500 firmware versions enable a charge ceiling to reduce cell stress during extended mains use. Check the power management settings in the BIOS or MaxData battery utility for a "battery protection" or "charge limit" option and set it to 100%. If no such setting exists, a BIOS update from the manufacturer may reset the charge ceiling to full capacity.

The battery percentage on the ECO 4500 jumps erratically — drops 15% in minutes, then holds steady for an hour. How do I fix it?

The fuel gauge IC needs several full calibration cycles against the new cell before its state-of-charge tracking stabilises. Erratic jumps in the first few cycles are normal — the IC is still interpolating voltage-to-capacity data points across the new cell's discharge curve. Run three full discharge-to-hibernate and full charge-to-100% cycles without partial interruptions. By the third cycle the gauge readings should track smoothly and the large sudden drops should stop.

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