Rechargeable Lithium-Ion Battery For Sony PXW-X70 - (Guaranteed To Work Exactly Like The Original Sony & Last Longer!) Guaranteed To Work Exactly Like The Original Sony Brand & Give You Longer Recording Time! Chemistry: Lithium Ion- Definition: Does not retain harmful memory which allows you to recharge anytime without affecting it's overrall performance and life. 4200 Mah Includes 1 Year Warranty