▁three ▁hours ▁by ▁plug ging ▁into ▁a ▁standard ▁ 1 1 0   vol t ▁elect rical ▁out let . ▁ ▁Br am mo ▁has ▁stated ▁the ▁En ert ia ▁does ▁not ▁have ▁reg ener ative ▁bra king ▁because ▁of ▁the ▁limited ▁benefit ▁that ▁current ▁reg ener ative ▁bra king ▁technology ▁provides ▁to ▁motor cy cles , ▁and ▁the ▁risk ▁of ▁tra ction ▁problems . ▁ ▁According ▁to ▁Cy cle ▁World ▁magazine , ▁" With ▁its ▁wide , ▁m ild - r ise ▁handle bar , ▁sport y ▁ste ering ▁geometry ▁and ▁narrow ▁ 1 8 - inch - front / 1 7 - inch - re ar ▁Av on ▁Road R iders , ▁the ▁En ert ia ▁is ▁a ▁light ▁and ▁respons ive ▁handler ." ▁The ▁road ▁test ▁editor ▁recorded ▁a ▁ 0 - 6 0 ▁m ph ▁time ▁of ▁ 1 6 . 1 ▁seconds , ▁and ▁a ▁quarter - mile ▁run ▁of ▁ 2 0 . 1 9 ▁seconds ▁at ▁ 6 0 . 7 8 ▁m ph . ▁▁▁▁ ▁The ▁current ▁testing ▁versions ▁of ▁the ▁En ert ia ▁being ▁shown ▁to ▁the ▁media ▁are ▁described ▁as ▁enjoy able ▁to ▁ride , ▁nim ble ▁and ▁easy ▁to ▁control . ▁▁ ▁It ▁is ▁also ▁capable ▁of ▁better ▁speed ▁than ▁widely ▁promised , ▁up ▁to ▁, ▁although ▁this ▁quickly ▁dra ins ▁the ▁battery . ▁ ▁Most ▁of ▁the ▁cost ▁of ▁the ▁motor cycle ▁is ▁due ▁to ▁the ▁battery . ▁ ▁Br am mo ▁is ▁hoping ▁for ▁the ▁cost ▁of ▁this ▁component ▁to