[ONE FOR ALL TOOLS] Litheli 20 V battery works with ALL Litheli 20 V tools. Charge the battery once every 3 months if it's not in use, to ensure its long-term performance. [ONBOARD BATTERY LIFE INDICATOR] 4 LED lights indicate remaining runtime before next recharge [ULTRA LOW SELF-DISCHARGE] Low self-discharge design ensures maximum performance [Battery Share For Litheli Tools Only] Litheli 20 V battery can (and ONLY can) power Litheli 20 V tools, and Litheli 20 V tools can share the same Litheli 20 V battery. To ensure long-term performance, charge the battery once every month when not use. [PERFECT AFTER-SALES SERVICE] Litheli has been working with industry experts for decades to present a battery pack of top quality & reliability.