Your new batterys will give you better and longer performance if you do a forming charge first. This is charging for 16 hours at 0.1C. It may take two or three cycles of this to bring them up to full capacity. Discharge at 0.25C to 0.9 to 1 volt/cell between cycles. See www.rcbatteryclinic.com for some very good advice on how to treat your batteries for best results.