New Lithium-ion battery pack, new technology, longer run time. Suits EY7440LZ2S, EY7540LZ2S, EY7541LZ2S, EY7542LZ2S, EY7840LZ2S, EY4542X, EY4640X, EY4541X, EY3740B. Panasonic 3.3Ah cobalt lithium ion battery performs better.... to get the full story click here
Volts: 14.4 Capacity mAh: 3300 Chemistry: Li-Ion Replaces Part #: EY9L40B 'N' Type