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Power Adapter Charger for Asus S551LB
KSh 3,109.00
Technical Specifications
| Metric | Verified Hardware Target |
| Exact Model Support | Asus VivoBook S551LB Series |
| Physical Connector Profile | 5.5mm × 2.5mm Standard Circular Barrel Plug (Hollow center, no center needle pin) |
| Output Voltage Standard | 19 Volts (DC) |
| Amperage Handling Threshold | 3.42 Amperes |
| Total Wattage Rating | 65 Watts (Note: The baseline power specification for the S551LB configuration is 19V 3.42A 65W. While a higher-capacity 90W charger with the same 5.5mm barrel size can be substituted to decrease charging times safely, underpowered 45W modules must be avoided as they will overheat and cause performance throttling when the GPU activates). |
| Input Grid Compatibility | AC 100V – 240V, 50Hz – 60Hz Universal Standard Range |
| Form Factor Configuration | Inline external transformer brick paired with a detachable 3-pin AC power cord |
Power Adapter Charger for Asus S551LB
The Asus S551LB is an advanced, high-performance configuration within the 15.6-inch VivoBook Sleekbook lineup. What distinguishes the S551LB from lower-tier baseline models is the integration of a dedicated NVIDIA GeForce GT 740M dedicated graphics card. Because this machine powers an independent GPU alongside an Intel Core processor and a responsive multi-touch glass panel, its dynamic power usage rises significantly under heavy computation, 3D processing, or media rendering workflows.
To prevent sudden system slowdowns and protect your system board from damage, using a clean direct current (DC) supply is critical. Cheap, unshielded aftermarket universal chargers or underpowered generic adapters must be avoided. Low-end accessories lack standard internal line filters and inject significant electrical noise into the laptop, which often results in unstable touchscreen tracking, erratic trackpad behavior, and accelerated battery degradation.
Asus S551LB Product Overview
This high-grade external power supply matches the exact structural architecture, voltage profiles, and physical plug dimensions of the original factory-supplied Asus S551LB brick. The input port on this dedicated laptop chassis requires a standard legacy 5.5mm outer diameter by 2.5mm inner diameter (5.5mm × 2.5mm) circular barrel tip. This wide, hollow connection fits securely into the laptop’s internal charging port, distributing cord strain evenly and preventing electrical arcing.
Asus S551LB Key Features
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Rugged 5.5mm × 2.5mm Circular Tip: Built to withstand daily plug cycles and travel strain without bending or loosening inside the port.
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Steady 65W Continuous Delivery: Supplies sufficient headroom to run dedicated NVIDIA graphics cards while charging the battery efficiently.
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Complete Circuit Isolation Shield: Built-in safeguards protect sensitive system components against sudden over-voltage (OVP), over-current (OCP), and short-circuit faults (SCP).
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Heat-Resistant Composite Case: Encased in fire-retardant materials designed to dissipate heat safely during long processing sessions.
Asus S551LB Technical Specifications
| Metric | Verified Hardware Target |
| Exact Model Support | Asus VivoBook S551LB Series |
| Physical Connector Profile | 5.5mm × 2.5mm Standard Circular Barrel Plug (Hollow center, no center needle pin) |
| Output Voltage Standard | 19 Volts (DC) |
| Amperage Handling Threshold | 3.42 Amperes |
| Total Wattage Rating | 65 Watts (Note: The baseline power specification for the S551LB configuration is 19V 3.42A 65W. While a higher-capacity 90W charger with the same 5.5mm barrel size can be substituted to decrease charging times safely, underpowered 45W modules must be avoided as they will overheat and cause performance throttling when the GPU activates). |
| Input Grid Compatibility | AC 100V – 240V, 50Hz – 60Hz Universal Standard Range |
| Form Factor Configuration | Inline external transformer brick paired with a detachable 3-pin AC power cord |
Asus S551LB Price Breakdown
Investing in a well-insulated, premium replacement power supply keeps your dedicated graphics card and processor safely buffered from electrical grid spikes:
| Power Supply Configuration | Estimated Retail Price Range (KES) | Recommended Application |
| Premium Standard 65W AC Adapter (5.5mm Tip) | KES 2,500 – KES 3,500 | The official hardware standard. Safely handles 3D graphics loading, multi-tab data research, video encoding, and continuous battery replenishment. |
Asus S551LB Pros & Cons
Pros:
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Excellent Connection Durability: The large 5.5mm plug barrel offers superior structural strength compared to fragile modern 4.0mm or 3.0mm micro-pins, which can break easily under minor side pressure.
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Widespread Sourcing Availability: Because this 19V 5.5mm standard was used extensively across multiple generations of Asus notebooks, sourcing replacement components locally is highly efficient.
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Balanced Thermal Control: The 65W transformer layout offers ample surface area to dissipate heat efficiently, remaining well within safe handling temperatures during peak charging periods.
Cons:
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Bulkier Travel Weight: Carrying the thick rectangular brick alongside its grounded 3-prong AC wall cable takes up considerably more storage space in a backpack than hyper-compact Type-C phone adapters.
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Incompatible with Slimmer Hardware: The wide 5.5mm tip profile cannot fit into newer, ultra-thin Asus notebook releases that require small micro-charging sockets.
Asus S551LB Verdict
To guarantee stable operation for your dedicated graphics system and protect the internal motherboard layers, replacing your old adapter with a high-quality 19V replacement charger featuring a 5.5mm × 2.5mm circular barrel plug is mandatory. Sticking strictly to these original power parameters delivers smooth, clean energy flow, keeping your VivoBook configuration running efficiently.
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