Battery for ASUS V5050E V5100E S5500F M5100U FL8800I Series 11.55V 42Wh B31N1842 [3-Year Warranty]

**Product Overview**
Upgrade or replace your aging ASUS laptop battery with this premium-grade 11.55V 42Wh (3800mAh) lithium-ion battery. Designed specifically for the V5050E, V5100E, S5500F, M5100U, FL8800I series and the original part number B31N1842, it delivers reliable power for your daily tasks, from web browsing to video streaming.

**Important Voltage Warning**
Please confirm your original battery voltage is 11.55V before purchasing. Using an incorrect voltage may cause charging failure or damage your device. This battery is NOT compatible with 7.6V, 11.1V, or 14.8V models.

**Compatible Laptop Models (including but not limited to): **
- ASUS V5050E Series (V5050EA, V5050EB, etc. )
- ASUS V5100E Series (V5100EA, V5100EB, etc. )
- ASUS S5500F Series (S5500FA, S5500FB, etc. )
- ASUS M5100U Series (M5100UA, M5100UB, etc. )
- ASUS FL8800I Series
- Also fits: ASUS X515, X515EA, X515EB, X515EP, VivoBook 15 series (check voltage first)

**Compatible Original Part Numbers: **
B31N1842, B31N1842-1, B31N1842-2, B31N1842-3

**Specifications Table: **
| Parameter | Value |
|-----------|-------|
| Battery Type | Lithium-Ion (Li-ion) |
| Voltage | 11.55V |
| Capacity | 42Wh / 3800mAh |
| Cells | 3-cell |
| Color | Black |
| Weight | Approx. 220g |
| Dimensions | 270 x 40 x 20 mm (check fitment) |
| Warranty | 3 Years |

**Comparison Table (vs.
Original Battery): **
| Feature | This Replacement | Original ASUS |
|---------|------------------|---------------|
| Voltage | 11.55V | 11.55V |
| Capacity | 42Wh | 42Wh |
| Safety Protection | Overcharge, Overheat, Short-Circuit | Same |
| Price | Affordable | Higher |
| Warranty | 3 Years | 1 Year (typical) |

**Installation Tips: **

1. Power off your laptop and unplug the AC adapter.

2. Remove the bottom panel screws (refer to your laptop manual).

3. Disconnect the old battery cable and remove it.

4. Insert the new battery, connect the cable, and secure the panel.

5. Charge fully before first use for optimal performance.

6. If the battery is not recognized, check the connector alignment.

**Package Includes: **
1 x Replacement Battery (B31N1842 compatible)
1 x Installation Guide (basic)

**Note: ** This is a third-party replacement product, not manufactured by ASUS. All brand names and model numbers are for compatibility reference only.