Vvolt is offering some solid holiday sale savings on three of its e-bikes through December 31, all of which are getting free extra battery packages for double the mileage. The sole price cut along with the extra batteries goes to the Centauri SE Commuter e-bike that has fallen to $2,599 shipped. Normally this quality model would run you $3,299, though we’ve been seeing it return to this same low rate during sales since September. On top of the $700 in cash savings, which already makes it an affordable deal, but you’re also getting a free extra battery on top of that (valued at $400) for a combined $1,100 in savings – the most we’ve seen on this model so far.