If this subject has already been discussed in another thread, please point me to it ... I couldn't find it with a search.
I'm puzzled by what appears to be conflicting information from MTH about Ni-cads vs. NiMH batteries for their Protosound engines. One MTH document (possibly outdated ? but still online) justifies the use of Ni-cads as being superior to Ni-MH batteries for most users. This document neglects to mention the "memory effect" problem with Ni-cads. I know about BCR's and am aware that many folks prefer them for replacements. I have two PS1 MTH locos and probably need replacement batteries. I know that they should be 8.4v rechargeables, not the more common 7.2v batteries. I recently bought a "PS1 reset kit" to fix someone else's MTH trolley and it came with the green battery.
My question is: what is the story with these seemingly conflicting documents?
http://www.mth-railking.com/service/nicad.asp
Why M.T.H. Uses NiCad Batteries and When to Replace Them
1) NiMH batteries self discharge faster than NiCads. This means the NiMh batteries will need to be replaced more often over long periods of non-use.
2) The NiCad battery self discharge rate is 10% less than the comparable NiMH battery. This has a significant impact on the performance of locomotives right out of the box. For example, after 10 months of non-use, the NiCad battery has 3-4 times the stored charge (in "mAh") compared to a NiMH battery under the same condition. This means MTH locomotives equipped with the NiCad battery will most likely have a charge to operate properly the first time out of the box.
3) NiCad batteries are rated at 500 to 5000 charge/discharge cycles compared to 250 to 2000 charge/discharge cycles for the NiMH battery. This means you will need to replace NiMH batteries more often if you regularly operate your locomotives.
4) The NiCad battery has more than enough storage capacity to operate MTH locomotives properly.
5) The NiMH battery costs more than the NiCad.
http://www.mthtrains.com/content/50-1008
RECHARGEABLE Ni-MH BATTERY is the M.T.H. recommended replacement for all M.T.H. Proto-Sound and 5v Proto-Sound 2.0 equipped locomotives. Can be recharged using any NiMH 8.4v Battery Charger.
