Battery for ASUS U4000U RX410U UX310U RX310U U410U B31N1535 11.4V 38Wh 2-Cell Li-ion Laptop Battery [High Capacity & Long Cycle Life]

**Product Description**
Upgrade or replace your aging ASUS laptop battery with this high-performance 11.4V 38Wh 2-cell Li-ion battery, specifically designed for the ASUS U4000U, RX410U, UX310U, RX310U, U410U series and compatible with original part number B31N1535. Whether your current battery no longer holds a charge, drains quickly, or causes unexpected shutdowns, this replacement will restore your laptops portability and productivity.

** Important Voltage Warning**
Please verify that your original battery voltage is ** 11.4V ** before purchasing. Using an incorrect voltage battery may damage your laptop or cause safety hazards. This battery is NOT compatible with 7.6V, 14.8V, or 15.2V models.

**Compatible Laptop Models (Partial List) **
- ASUS ZenBook UX310U series (UX310UA, UX310UQ, UX310UV, etc. )
- ASUS ZenBook U4000U series
- ASUS VivoBook RX410U series
- ASUS VivoBook RX310U series
- ASUS U410U series
- Original battery part number: B31N1535

**Specifications**
| Parameter | Value |
|-----------|-------|
| Voltage | 11.4V |
| Capacity | 38Wh (3300mAh typical) |
| Cell Type | 2-cell Li-ion |
| Color | Black |
| Connector | 6-pin (original fit) |
| Weight | Approx. 200g |
| Certification | CE, FCC, RoHS |

**Comparison Table**
| Feature | Our Battery | Generic/Unknown Battery |
|---------|-------------|-------------------------|
| Voltage Accuracy | 11.4V ± 0.1V | Often mismatched |
| Protection IC | Yes (overcharge/discharge/short circuit/temp) | May lack full protection |
| Cell Grade | Grade A+ Li-ion cells | Recycled or low-grade cells |
| Warranty | 12 months | Usually 3-6 months |

**Installation Tips**
1. **Power off** your laptop and unplug the AC adapter.
2. Remove the bottom panel screws (refer to your laptops service manual).
3. Disconnect the old battery cable and remove the battery.
4. Connect the new battery cable, place it into the compartment, and secure with screws.
5. Reattach the bottom panel, plug in the charger, and let the battery charge fully before first use.
6. For optimal lifespan, avoid deep discharge (below 10%) and store at 40-60% charge if not used for long periods.

**Package Includes**
- 1 x Replacement Battery for ASUS B31N1535
- 1 x Screw set (if applicable)
- 1 x Installation guide (digital copy available upon request)

**Customer Support**
We offer 12-month warranty and 30-day hassle-free returns. If you have any questions about compatibility or installation, please contact us via eBay/Newegg messaging were here to help!

*Note: This is a third-party replacement product, not an original ASUS item. ASUS and ZenBook are registered trademarks of ASUSTeK Computer Inc. Use of these trademarks is for reference only and does not imply any affiliation or endorsement. *