Making sense of battery packs. What is a battery pack? Great question. As I am not a writer what I am going to does it this. I am going to touch on a few key points to explain a bit about battery packs so you will have a general idea as to what type of battery pack you may need or how many cells you will require to rebuild your battery pack. Lets use a 9.6 volt battery pack as an example. Lets say you have a battery pack that is 9.6 volts and you want to replace it. Great lets do that. First off I want to inform you that any 9.6 volt battery pack will do the job of another however I am sure you will have size restraints. A 9.6 volt battery pack consist of 8 individual batteries of 1.2 volt each. Different size battery packs use different size cells. There are many different size cells such as sub c mainly for drills 2/3 a, 2/3 aa, aa cells and many others. Before you do anything remove the batteries from your battery pack and take the measurements that way when you call me I can really help you out without playing guessing games. Lets touch on the voltage aspect of the pack. Below you will see a list of voltages and how many cells you will require to rebuild them. 2.4 volt 2 cells of 1.2 volt 3.6 volt 3 cells of 1.2 volt or 1 lithium ion cell 4.8 volt 4 cells of 1.2 volt 6 volt 5 cells of 1.2 volt 7.2 volt 2 cells of 1.2 volts 8.4 volts 7 cells of 1.2 volts I hope you see what I mean as to how a battery packs is configured. It may be possible that you have a 3.7 volt 7.4 volt 11.1 volt or 14.4 volt battery pack which would have lithium ion cells. Lithium ion cells are different from nicad or nimh cells. I can help you with that as well. Should you have any question on battery packs or battery pack assembly please email me adam@onlybatteries.com or call me toll free 1-800-660-7705. I would be my pleasure to see to it that you get the right batteries or battery pack.