DENAQ 6-Cell 58Whr/5400mAh Li-Ion Laptop Battery for IBM THINKPAD 390, IBM THINKPAD 390E, IBM THINKPAD 390X, IBM THINKPAD I1700, IBM THINKPAD I1720, IBM THINKPAD I1721 Replaces IBM/LENOVO Parts 02K6513, 02K6520, 02K6521, 02K6534, 02K6535, 02K6536, 02K6537, 02K6610, 02K6611, 02K390