The HP EliteBook 840 G2 charger typically operates at 18.5 volts (V).
Understanding Your HP EliteBook 840 G2 Charger's Voltage
The voltage is a critical specification for any laptop charger, dictating the electrical potential provided to your device. For the HP EliteBook 840 G2, the standard output voltage is 18.5V, paired with a 3.5 amp (A) current output. This combination ensures your laptop receives the correct power to charge its battery and operate efficiently without risk of damage.
Why Correct Voltage is Crucial
Using a charger with an incorrect voltage can lead to serious issues for your laptop.
- Too Low Voltage: If the charger's voltage is significantly lower than required, the laptop might not charge at all, or it could charge very slowly. It might also struggle to power the laptop during use, leading to performance issues or unexpected shutdowns.
- Too High Voltage: A charger supplying voltage higher than 18.5V can severely damage internal components of your HP EliteBook 840 G2, potentially leading to irreparable harm to the motherboard, battery, or other crucial circuits. This is a common cause of laptop failure and should be avoided at all costs.
Key Charger Specifications
When looking for a replacement or checking your current charger, these are the essential specifications for the HP EliteBook 840 G2:
| Specification | Value | Description |
|---|---|---|
| Voltage | 18.5V | Electrical potential supplied to the laptop. |
| Amperage | 3.5A | Maximum current delivered to the laptop. |
| Power | 65W (18.5V x 3.5A) | Total power output (Voltage x Amperage). |
| Connector | 4.5mm x 3.0mm | Blue tip with a pin inside (HP's "Smart Pin" connector). |
Note: While 18.5V is standard, some compatible chargers might list a slightly different voltage (e.g., 19V) if they are designed to be broadly compatible across a range of HP models. Always verify the amperage and connector type.
Identifying the Right Replacement Charger
To ensure you purchase the correct charger for your HP EliteBook 840 G2, consider the following steps:
- Check Your Old Charger: The easiest way is to examine the label on your original HP charger. It will clearly state the "Output" voltage (V) and amperage (A).
- Consult Laptop Documentation: If you still have the user manual or specification sheet for your EliteBook 840 G2, it will list the required input power specifications.
- Verify Connector Type: HP laptops often use specific connector types. The EliteBook 840 G2 typically uses a 4.5mm x 3.0mm "blue tip" connector with a central pin. Ensure your replacement charger has this exact connector to fit properly.
Where to Purchase a Reliable Charger
When purchasing a replacement, it's recommended to:
- Official HP Store: Buy directly from the official HP website or authorized resellers to guarantee authenticity and compatibility.
- Reputable Electronics Retailers: Stores like Amazon, Best Buy, or similar reputable electronics outlets often carry genuine or high-quality third-party compatible chargers. Always check reviews and product specifications carefully.
- Avoid Generic Chargers: While seemingly cheaper, generic or unbranded chargers often lack safety features and may not deliver stable voltage or amperage, posing risks to your laptop.
Using a charger that matches the 18.5V and 3.5A specifications is essential for the longevity and safe operation of your HP EliteBook 840 G2.
