Refurbished: Lenovo Thinkpad 13 FHD (1920x1080) 13.3" IPS Grade A Business Laptop, Intel 7th Gen Celeron 3865U Professor, 1.8GHz Base Frequency, 16GB DDR4 RAM, 256GB SSD, Wi-Fi, Bluetooth, Windows 10 Pro 64-bit
🛠️ Lenovo ThinkPad L13 Gen 2 - disassembly and upgrade options - YouTube
Lenovo ThinkBook 13s - disassembly and upgrade options - YouTube
A-Tech 16GB RAM for Lenovo ThinkPad 13 20J1 | DDR4 2133 SODIMM PC4-17000 1.2V 260-Pin Memory Upgrade Module at Amazon.com