Lithium Ion Battery 20V 2.0Ah 1 Pack, Replacement Lithium-ion Battery for LU10 Cordless Leaf Blower Tool, Long Life Battery Work Please note:Product Safety is Top 1 to consider, we've implemented overheat protection in our batteries to ensure consumer safety. Follow these battery maintenance tips: 1) Fully charge the batteries before first use. 2) Allow batteries to cool for 5-10 minutes before charging after use to prevent overheating. 3) If not using for an extended period, store batteries with a full charge and recharge every 6 months