P181 (4-P102) 18-Volt ONE+ Compact Lithium-Ion Batteries (4-Pack) Retail Package of 4 P102 Batteries Compatible with all Ryobi 18-Volt ONE+ products Compact lithium-ion battery compared to 18-Volt Ni-Cd (P100): up to 20% more runtime 45% lighter weight reduces user fatigue Fade-free power for maximum performance