I have 2 6 cell matched packs. IB4200s from Hefty cells. Packs have been ran maybe 5 times. Pack one is 452 run time and 1.225/1.226 voltage. Pack 2 is 443 run time and 1.227/1.228 voltage. Packs charged on a GFX and trayed on a smart tray to 1.0 I will take 65.00 shipped for the 2 packs.