Boosted extended range battery like it was new. All Boosted extended range batteries were produced between 2016-2017 with a few outliers before or after. These batteries are now getting to be 8-10 years old and starting to fail or have less range, but fear not, we have taken these batteries apart and put new guts in them to give them a new life. Brand new 18650 cells have been swapped in place of the old aged cells. These new cells give you essentially a brand new battery with exceptions to the outside (scratched & dent special) outside casing. so although these batteries might look used on the inside, they will perform brand new like they just came from boosted themselves the day they launched these batteries.