After the battery 3310 after 12 years of service slowly walked into my Nokia to its knees, had a New ago. No sooner said than done - wanted on Amazon and ordered these Li-lon battery. The battery fits perfectly into the mobile phone, and has held 10 days after the full charge. (At night was the phone) Now I can use my beloved Nokia continues and must me none of the new-fangled gizmos buy, which after a day need to be recharged again.