I charged it exactly 1C. The Lipo is 3 cell 2200 mAh. I charged it at 2.2 amp. What I just don't understand is when I monitored the Smart Balancer, the amp rating went up to 2.3 amp and then back to normal. I have charged four Lipos about every day and had no problems until I accidentally shorted one. I wish the companies make safer Lipos. One slight accident can damages the Lipo or catches fire,