Extra Batteries and a 110 volt charger.

Here is a link to Amazon for batteries and a 110 volt charger.....

http://www.amazon.com/gp/product/B00BJUERRC/ref=ox_sc_sfl_title_1?ie=UTF8&psc=1&smid=A2GY8PEJGW1TC2


http://www.amazon.com/gp/product/B00AWL5N3G/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=A1TL90X2K3L8U6

Also don't leave your batteries plugged in overnight guess it shortens the battery life from what I am reading.

One other thing number your batteries when using multiple ones.