Hi gang how's u ,Took me rc car out today after 2 months sunny warmish day battery's been on storage charge cuz I got a balance charger as advised by u guys,give both battery's a quick burst charge b4 I took them out 1 batt 4000mah the other 5200 mah,put the 4000 in first didn't go as fast as wot expected change to the 5200 went faster?using lipo batts in a brushed machine didn't get as much time as I used to,battery's kept in small cardboard box with padding,wot cud be reason 1st batt didn't go as fast no physical damage to battery's,only reason I cud think of if battery's were low in controller?wud that effect car battery's?thx