Energizer Lithium AA have a little more than half the capacity of NiMH C cells and cost twice as much as alkaline C cells. Is there a pressing need for primaries? If not, you'll save a lot of money in the long run using rechargeable NiMH C cells and with more capacity than Energizer Lithium.The other choice might be to find an adapterto go from a C size to a AA lithium battery.
In this case, primaries are the way to go. Either C alkalines or (if you want to minimize the risk of leakage) lithium AAs with AA to C adapters. Also, keep in mind (since you mentioned the bus roof) that lithiums will have better performance at extreme temperatures, especially in the cold.It is a single C size cell that may be changed every year or even less frequently. It is a very low draw situation, but the technicians have to get on a ladder to get to the bus roof.
(I Googled the primary vs secondary and it looks like primary are single use and secondary are rechargeable.)
I also looked to see if there is any adapter to go from C size to another size, but all I found is C to AA adapters.
Thank you for the reply.
I was hoping to avoid the alka-leak batteries and go with a lithium size C, but I can't find any.
The other choice might be to find an adapterto go from a C size to a AA lithium battery.