BTI DL-E5440X9 10.8V 91Wh Li-Ion Battery for Dell Latitude E5440/E5540

Meet the BTI DL-E5440X9, a high-capacity replacement battery designed to restore and boost your Dell Latitude E5440 and E5540’s power. This 10.8-volt, 91-watt-hour Li-Ion pack is engineered to deliver dependable performance, extended runtimes, and reliable charging that keeps you productive on the go. Built to align with Dell’s OEM specifications, it replaces common OEM part numbers 451-BBID, 970V9, N5YH9, and VV0NF, ensuring a secure fit and seamless operation in Latitude laptops. Whether you’re a professional, student, or remote worker, this BTI battery helps you stay unplugged longer, tackle tasks, and travel lighter without sacrificing performance or energy efficiency.

• OEM-compatible with Dell Latitude E5440 and E5540, matching part numbers 451-BBID, 970V9, N5YH9, VV0NF for a secure, plug‑and‑play replacement.
• High-capacity 91Wh energy storage for extended runtimes, enabling longer work sessions, more mobile productivity, and fewer interruptions during travel.
• Faster charging capability reduces downtime, letting you recharge quicker than many standard third-party batteries and return to work sooner.
• Reliable Li-Ion chemistry and robust safety features safeguard against overcharge, short circuits, and thermal issues while preserving battery health over multiple cycles.
• Engineered for consistent performance and dependable usability, with a design that minimizes weight and maintains balance for comfortable portable use.

Technical Details of BTI DL-E5440X9 10.8V 91Wh Li-Ion Battery

• Model: DL-E5440X9
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage: 10.8V
• Capacity: 91Wh (approximately 8.4Ah)
• Cell Configuration: 6-cell design (balanced power delivery and weight)
• Compatibility: Dell Latitude E5440, E5540
• OEM Part Numbers (replacements): 451-BBID, 970V9, N5YH9, VV0NF

How to Install BTI DL-E5440X9 Battery

• Power down your Dell Latitude completely and unplug any connected power adapters or accessories.
• Close the lid and place the laptop on a stable, clean surface. Turn it over to access the bottom panel.
• Remove the screws securing the bottom cover, then carefully detach the panel to reveal the battery bay.
• Disconnect the existing battery connector, remove the old battery, and align the BTI DL-E5440X9 into the bay with the connectors facing the same direction as the original.
• Secure the new battery in place with the mounting screws, reattach the bottom cover, and plug in the charger. Power on the laptop and verify normal startup.

Frequently Asked Questions

• Q: Is this BTI DL-E5440X9 battery compatible with Dell Latitude E5440 and E5540 laptops?
  A: Yes. This BTI replacement battery is designed to fit and perform with Dell Latitude E5440 and E5540 models and matches OEM part numbers 451-BBID, 970V9, N5YH9, and VV0NF to ensure a secure fit.
• Q: What are the key specifications of this battery?
  A: The battery is a 10.8V Li‑Ion pack with a capacity of 91Wh (about 8.4Ah). It is built to provide extended runtime while fitting the Latitude E5440/E5540 chassis and maintaining safe operation.
• Q: Will this battery charge faster than other replacements?
  A: The BTI DL-E5440X9 is described as taking lesser time to charge compared to some alternatives, helping you reduce downtime and get back to work sooner.
• Q: What safety features does this battery include?
  A: It uses standard Li‑Ion safety protections and carefully engineered circuitry to guard against overcharge, short circuits, and overheating, contributing to safer operation and longer life.
• Q: How should I maintain the battery to maximize life?
  A: For best results, avoid prolonged exposure to high temperatures, perform occasional calibrations by fully charging and discharging the battery, and store it in a cool, dry environment when not in use for extended periods.
• Q: Is this an official Dell battery?
  A: This is a BTI replacement battery designed to be compatible with Dell Latitude E5440/E5540 models and OEM part numbers. It is not a Dell-branded original equipment battery, but it is built to Dell-compatible specifications for reliable performance.