https://docs.google.com/spreadsheets/d/1vnpEXfo2HCGADdd9G2x9dMDWqENiY2kgBJUu29f_TX8/pubhtml#
Stock charger is best, but anything rated a "3" and has the "full 18w charge" will work the same, but for $35 free shipping it makes more sense to just buy the stock charger straight from Google. 6ft...