STLIERT 300W Laptop Charger 11mm x 5.5mm Yellow Tip

High-power 300W replacement AC adapter from STLIERT engineered to safely run Lenovo Legion, ThinkPad and select Y-series laptops that use the 11mm x 5.5mm yellow square tip.

When your original power brick is lost, damaged or underpowered, this STLIERT 300W laptop charger supplies stable 20V at up to 15A for demanding gaming rigs and mobile workstations. Built with a tinned copper core for better conductivity and heat management, it supports a wide set of Lenovo model numbers and legacy ADL part references so you can plug in and resume heavy workloads or gaming sessions without swapping batteries or throttling performance.

Which Lenovo models will this 300W charger run?

This adapter is made to work with many Legion, ThinkPad and Y/Y9000 series laptops that accept the 11mm x 5.5mm yellow square connector and require up to 300W. Check your laptop’s power jack shape and the OEM part numbers listed in your system before buying.

• Legion series: Legion 5/7 and Legion Pro families (various 15" and 16" models listed)
• ThinkPad and workstation models: P50–P73, several P-series variants
• High-end Y/9000/9000K gaming laptops that reference ADL300SLC3A or ADL300SDC3A

How does the STLIERT 300W keep power delivery stable under load?

STLIERT uses a tinned copper core and robust internal components to reduce resistance and improve heat dispersion, helping maintain steady voltage during intensive tasks. The adapter is rated for wide input range and continuous high-current output so it can handle spikes from gaming or rendering workloads.

• Tinned copper conductor for improved conductivity and thermal performance
• 100V–240V wide input tolerance for global use
• Designed to deliver 20V at up to 15A (300W) continuously

Is this charger safe and compatible with my laptop’s original part numbers?

This replacement lists many OEM reference numbers and ADL series identifiers it’s compatible with; match those to your laptop’s service label or existing adapter. While it’s built to meet electrical requirements, confirm connector shape and voltage specifications before use to avoid mismatches.

• Matches ADL300SLC3A, ADL300SDC3A and several ADL/SA10 OEM codes
• Connector size: 11mm x 5.5mm yellow square tip — visually verify fit
• Supports models previously served by 230W adapters where noted

What practical details should I expect on delivery and daily use?

The charger ships as a compact external power brick with integrated output cable and a three-prong AC input lead. For portable workflows, it’s suitable for desk or travel use but remember its weight and heat output will be greater than lower-watt adapters.

• Includes the 11mm x 5.5mm yellow square tip cable permanently attached
• Compatible with international voltages (100–240V), use local power cord where required
• Recommended for desks and travel; allow ventilation while in use

Who this is for: This STLIERT 300W adapter is intended for Lenovo owners who need a high-capacity replacement for gaming laptops or mobile workstations that require up to 300W. If your machine lists the ADL300SLC3A / ADL300SDC3A or similar OEM codes and uses the yellow square connector, this charger is a direct, high-performance alternative to the original factory brick. If you’re unsure, verify the connector size and your laptop’s power rating before purchasing.