TP6500mAh Pro Power up to 260A/520A burst TP6500 2S (7.4V) Rating: 40/80C Norm/Max Discharge Output: 7.4V Nominal, 6500mAh Dimensions/wt: 5 3/8" x 1 3/4" x 1", 12.3 oz. 135mm x 43mm x 25mm, 350g TP6500 5S (18.5V) Saddle Rating: 40/80C Norm/Max Discharge Output: 18.5V Nominal, 6500mAh Dimensions/wt: 5 3/8" x 3 1/2" x 1 1/4", 20.3 oz. 135mm x 90mm x 33mm, 860g

Pro Power 40C 6500mAh Battery packs are sold only in matched sets!!!
12S (44.4V) = (2) 5S + (1) 2S battery packs
10S (37V) = (2) 5S battery packs