(1) NEC Ultralite Versa, model # PC-410-1521 ( written / stamped at the back of the laptop computer. Serial # 3Y000249. (2) Need - Battery Repacking to replace the old worn ones ( 12 pieces ) ranging from DC 13.5V, 1.4 A needs 6 pieces. DC 11.5V, 2.8A needs 6 pieces. How do I assemble the 12 batteries in the right order for repacking purposes. Would you be so kind give detail instruction or refer me elsewhere. Waiting for your reply please.