DC9180 18V XRP™ Li-Ion Battery Pack is compatible with DEWALT® 18 Volt tools. XRP™ Li-Ion extended run-time battery provides long run-time & battery life. Lightweight design- 1.5 lbs; same weight as an 12V NiCd battery. No memory and virtually no self-discharge for maximum productivity and less downtime. DC9310 Charger Charges all DEWALT® 7.2V - 18V NiCd/NiMH/Li-Ion batteries (except Univolt batteries) so users need only one charger for multiple cordless products.