I would say go get a 4 cell pack. C&H ignitions runs great and they run forever on a 4.8 pack. I have a C&H ignition on a old Brison 2.4 that have been running for years on a 4 cell 1100ma Nicad pack without a hiccup. The thing is, you can't go get a new C&H ignition module. I would not risk it and push it to 6v. You wont fully appreciate a good dependable ignition module until you've pulled out half your hair trying to figure out a bad one.