Need 3400mAh Lenovo 21L3P71 Battery? This 21L3P71 battery 100% compatible with Lenovo Thinkpad T14 Gen 3. The battery is up to standard and fully compatible with original specifications. We offer 12 months warranty on our all batteries! During this period, if your battery fails, we will replace your 21L3P71 battery with a new one. All our batteries are certified by CE, UL, ROHS, ISO9001/9002 as safe products.