Battery for Dell Inspiron 5455/5555/5559/5558/3451/3458/3551 Series 11.4V 42Wh M5Y1K, High Capacity, 1-Year Warranty

**Product Overview**
This replacement battery is specifically designed for Dell Inspiron 5455, 5555, 5559, 5558, 3451, 3458, and 3551 series laptops. It uses the original M5Y1K battery model and provides a reliable power solution for users whose original battery no longer holds a charge or has degraded performance.

**Important Voltage Warning**
Please confirm your original battery voltage before purchasing. This battery is rated at ** 11.4V ** (nominal). It is NOT compatible with 7.6V, 11.1V, or 14.8V systems. Using an incorrect voltage battery may cause charging failure or damage to your laptop.

**Compatibility List**
This battery works with the following Dell Inspiron models (please check your laptops service tag or original battery label for exact match):
- Dell Inspiron 5455
- Dell Inspiron 5555
- Dell Inspiron 5559
- Dell Inspiron 5558
- Dell Inspiron 3451
- Dell Inspiron 3458
- Dell Inspiron 3551

**Replacement Part Numbers**
- M5Y1K
- 0M5Y1K

**Specifications Table**

| Specification | Value |
|---------------|-------|
| Battery Type | Lithium-Ion (Li-ion) |
| Voltage | 11.4V (nominal) |
| Capacity | 42Wh (3700mAh typical) |
| Cell Count | 3 cells |
| Color | Black |
| Weight | Approx. 220g |
| Dimensions | 200 x 60 x 20 mm (approx. ) |
| Warranty | 1 Year |

**Comparison Table: Original vs. Replacement**

| Feature | Original Dell Battery | Our Replacement Battery |
|---------|----------------------|------------------------|
| Cell Quality | OEM standard | Premium Grade A cells |
| Voltage | 11.4V | 11.4V (exact match) |
| Capacity | 42Wh | 42Wh (same capacity) |
| Safety Protection | Yes | Yes (overcharge/discharge/short circuit/temp) |
| Warranty | Limited (varies) | 1 Year |
| Price | Higher | Affordable |

**Installation Tips**
1. Power off your laptop and disconnect the AC adapter.
2. Remove the bottom panel screws (refer to your laptops service manual for exact steps).
3. Disconnect the old battery cable from the motherboard connector.
4. Remove the old battery and insert the new battery, aligning the connector properly.
5. Secure the battery with screws and reattach the bottom panel.
6. Plug in the AC adapter and charge the battery fully before first use (about 3-4 hours).

**Note: ** If your laptop does not recognize the new battery immediately, try
a hard reset: disconnect AC power, remove the battery, press and hold the power button for 15 seconds, then reinstall the battery and reconnect power.

**Package Includes**
- 1 x Replacement Battery (M5Y1K)


**Customer Support**
We stand behind our product. If you encounter any compatibility or performance issues, please contact us within 30 days for a full refund or replacement. Our team is ready to assist you.

**Order with confidence upgrade your Dell Inspirons battery life today! **