Fein Rechargeable Li-Ion Battery with Charge Indicator - 12 V, 6 Ah - 92604184020: Amazon.com: Tools & Home Improvement
FEIN 18V battery and charger set (2 batteries and charger) – Quality Tools Online
Fein Multimaster Tool AMM 500 Plus Top Oscillating Kit - 18V Battery-Powered Cordless Multi Tool for Interior Work and Renovation - Includes 30 Accessories and Case - 71293361090 - - Amazon.com
FEIN 61-Piece 18-volt Variable Speed Oscillating Multi-Tool Kit with Hard Case (2-Batteries Included) in the Oscillating Tool Kits department at Lowes.com