Our products are guaranteed for 12 months since the date of shipping. We use Samsung original cell (2200mAh and 2600mAh as per customers request) and other China brand cells (from 2000mAh to 2600mAh ... as per customers request), the protection PCB boards that developed by our professional RD team, which have over-charging, over-discharging, over-heating and over-current protections, its performance has reached or even exceeded the original laptop batteries, which gives our customers a peace of mind when using it.