Laptop Battery for Dell Inspiron 3421 3437 5421 5437 3521 5535 5521, 11.1V 48Wh MR90Y, High Capacity Compatible with 0MR90Y, 1 Year Warranty

**Product Overview**
This high-performance replacement battery is specifically designed for Dell Inspiron 3421, 3437, 5421, 5437, 3521, 5535, and 5521 laptops. It is a direct replacement for the original MR90Y, 0MR90Y, 1MR90Y, and 2MR90Y battery models. With a capacity of 48Wh / 4400mAh and a voltage of 11.1V, this battery ensures your laptop runs smoothly for work, study, or entertainment.

**Important Voltage Warning**
Please verify that your original battery voltage is exactly 11.1V. This battery is NOT compatible with 14.8V or 15.2V models. Using an incorrect voltage battery may damage your laptop or cause safety hazards. Always check the voltage label on your old battery before purchasing.

**Compatible Laptop Models (Not a full list, please check your model number)**
- Dell Inspiron 3421
- Dell Inspiron 3437
- Dell Inspiron 5421
- Dell Inspiron 5437
- Dell Inspiron 3521
- Dell Inspiron 5535
- Dell Inspiron 5521

**Compatible Battery Part Numbers**
- MR90Y
- 0MR90Y
- 1MR90Y
- 2MR90Y

**Specifications Table**

| Specification |

Details

|
|---------------|---------|
| Battery Type | Li-ion |
| Voltage | 11.1V |
| Capacity | 48Wh / 4400mAh |
| Color | Black |
| Cell Quantity | 6 cells |
| Weight | Approx. 300g |
| Dimensions | 270 x 60 x 20 mm (approx. ) |
| Warranty | 12 months |

**Comparison Table (Our Battery vs. Original)**

| Feature | Our Replacement Battery | Original Dell Battery |
|---------|------------------------|-----------------------|
| Capacity | 48Wh / 4400mAh | 48Wh / 4400mAh (same) |
| Voltage | 11.1V | 11.1V (same) |
| Safety Protection | Overcharge, Over-discharge, Short Circuit, Overheat | Standard protection |
| Price | Affordable | High cost |
| Warranty | 12 months | Usually 6-12 months |

**Installation Tips**
1. Turn off your laptop and disconnect the AC adapter.
2. Remove the battery latch or unscrew the battery compartment cover (if applicable).
3. Gently slide out the old battery and disconnect the cable (if present).
4. Insert the new battery into the slot, ensuring it clicks into place.
5. Reattach the cover or latch, then connect the AC adapter and charge fully before first use.
6. For optimal battery life, perform a full charge cycle (charge to 100%, then discharge to 10-20%) once a month.

**Package Includes**
- 1 x Replacement Battery


**Note: ** This is a compatible replacement product, not an original OEM battery. It is manufactured to meet or exceed OEM specifications. Please ensure your laptop model and original battery part number match the list above before ordering. If you are unsure, feel free to contact us with your laptops service tag or original battery part number for verification.