Battery for HP EliteBook 745 755 840 848 850 G3 G4 ZBook 15u CS03XL 11.4V 48Wh/57Wh, High Capacity, 1-Year Warranty

**Important
Voltage Warning**:
Please confirm your original battery voltage is ** 11.4V ** (not 7.6V or 14.8V ). Using an incorrect voltage battery may damage your device or cause safety hazards. Check your original battery label or system BIOS before ordering.

**Compatible Models List (Full): **
- HP EliteBook 745 G3, 745 G4
- HP EliteBook 755 G3, 755 G4
- HP EliteBook 840 G3, 840 G4
- HP EliteBook 848 G3, 848 G4
- HP EliteBook 850 G3, 850 G4
- HP ZBook 15u G3, ZBook 15u G4
- Also fits: HP ProBook 650 G2 (select models)

**Replacement Part Numbers: **
CS03XL, HSTNN-LB6T, HSTNN-DB6T, 840556-001, 840555-001, 840556-002, 840555-002, 840556-003, 840555-003, TPN-C103, TPN-C105, TPN-Q169, TPN-Q170

**Specifications Table: **
| Parameter | Value |
|-----------|-------|
| Chemistry | Li-ion |
| Voltage | 11.4V |
| Capacity | 48Wh / 57Wh (varies by model) |
| Cells | 3-cell / 4-cell |
| Color | Black |
| Weight | Approx. 250g |
| Warranty | 12 months |

**Comparison Table (Original vs Replacement): **
| Feature | Original HP Battery | Our Replacement |
|---------|--------------------|-----------------|
| Voltage | 11.4V | 11.4V (exact match) |
| Capacity | 48Wh | 48Wh / 57Wh (higher option) |
| Cell Grade | Standard | Grade A (longer lifespan) |
| Safety Cert | Yes | CE, FCC, RoHS |
| Price | High | Affordable |

**Installation Tips: **

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

2. Remove the bottom cover (if applicable) or slide the battery release latch.

3. Gently disconnect the old battery cable and remove it.

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

5. Charge fully (3-4 hours) before first use for optimal performance.

6. If battery is not detected, reset BIOS by holding power button for 30 seconds with AC adapter removed.

**Note: ** This is a third-party compatible battery, not an OEM HP product. However, it meets or exceeds original specifications. If you have any questions about compatibility, please message us with your laptop serial number.