Promatch cells are great Nimh cells, but before you spend the money you might want to look into a few different things. Compare the cost of one of those packs to the cost of going Lipo. The difference might not be as much as you think. Also, if you have any skills it is easy to rebuild your stick pack into a side by side formation, allowing you to equalize it and possibly get more performance from it. Finally, I would seriously consider a charger with an adjustable peak setting. Not only could you charge your current pack without so many false peaks, you can also take better care of any other packs you might buy in the future.