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Lenovo 4X21H27800 135W USB-C AC Adapter
Overview
The Lenovo 4X21H27800 is a 135W USB-C AC adapter designed for ThinkPad laptops that draw more power than a standard 65W or 90W charger can sustain — particularly relevant for ThinkPad workstation-class models running CPU and discrete GPU loads simultaneously. The universal input (100-240V, 2.5A, 50/60Hz) means it operates on any mains voltage worldwide without a separate converter, which matters for field deployments and international travel. At 135W delivered over USB-C, it keeps pace with sustained compute loads rather than slowly draining a battery under load — the difference between a charger that maintains charge during peak workloads and one that merely slows discharge.
Compatibility
Designed for Lenovo ThinkPad laptops that specify a 135W USB-C power requirement. This wattage tier is typically required by ThinkPad X1 Extreme, ThinkPad P-series mobile workstations (P14s, P15v, P16s), and select ThinkPad T and L-series configurations with discrete graphics. Before ordering, verify your ThinkPad's required wattage in the system BIOS or on the OEM label on the existing adapter — pairing a lower-wattage charger to a 135W-rated system will result in throttled performance or net battery drain under load. The USB-C connector is not interchangeable with the rectangular Slim Tip connector used on older ThinkPad lines; confirm your port type before purchasing.
Installation Notes
Plug into any USB-C power delivery port on the ThinkPad — on multi-port systems, use the port explicitly labeled for charging or the one nearest the system's power circuitry (typically left-side on ThinkPad X1 and P-series). The 100-240V universal input self-selects; no manual voltage switching is required. A country-specific outlet plug adapter may be needed outside North America — the adapter accepts standard IEC C8/C6 detachable cords.
Lenovo Thinkpad 135W Usb-c AC Adapter - 100-240V/2.5A 50/60HZ - 135WATT - 1 Year Warran - 4X21H27800
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