I've been using an older version of their battery(no guarantee it is from the same supplier/vendor) for about 10 years now.  I have gone as long as two years between operating periods, I put on a 20-30 minute charge session in neutral before running.

The 9v, in this case, refers to the physical size, which is what you want.  What the ad doesn't specify is the actual operating voltage.  Batteries of this "size" may have operating voltages of 7.2v or 8.4v.  You want an 8.4v.

Just for a test, try running those engines in conventional and you'll see how good those batteries are after setting for 2 years and a 30 second charge.

In command, as long as you have no track problems, the engines will actually run without a battery once added into your remote when the battery was fine. You only need the battery to save setting in the PS2 boards and to keep the engine from dropping into neutral from a momentary lose of track power.

How about a "roll your own" BCR replacement?  I ordered the parts for a few, looks like about $11/ea to build a battery replacement that will outlast the locomotive.  Even cheaper for newer 3V PS/2 locomotives, more like $6.

I only run conventional. 

They must be making batteries better than any that I've had in the past.

If you look around, there are low self-discharge batteries available.

Here's one that has a nominal voltage of 8.4 volts and is priced at $5.

Tenergy 9V 200mAh Low Self-Discharge NiMH Rechargeable Battery

I'd think these would be a better choice for something that is going to set on the shelf for a year or two.

And $5 shipping:-)  Looking at it, it also doesn't look like it is in a sealed case.  G

What makes you think it's not a sealed case?  I wonder what shipping would be if you bought a few?

FWIW, I'm going the homemade BCR clone for mine.

grJohn:  I assume you have simply ordered a large capacity capacitor?????

Well, not one, I followed the script that was posted previously for the 9V with four 3.3F 2.7V supercaps with zener diodes to equalize the voltages during charge.  This is the configuration.  I'm going to do some bench testing charging and discharging to see how this works out.

If you look at the terminal end, it looks like a typical Alkaline battery.  Vice a sealed unit.  RJR, good to see you have that add on disabled:-)  G

GGG, the question is why, of all the forumites, only I was a cause of this issue.  Surely, I am not the only one who jousts with Dragon 12.

grJ: To what script do you refer?

How do I make my own battery replacement? (BCR)

John,
I don't see the 8.4v listed on the product page;http://www.amazon.com/Tenergy-Centura-Self-Discharge-Rechargeable-Batteries/dp/B003QUNYQI/ref=sr_1_1?ie=UTF8&qid=1385242145&sr=8-1&keywords=9v+tenergy+batteries  which brings me to the question that I was try to answer when I started this search. If a battery is truly 9V instead of 8.4 V will that hurt the MTH engines?

Here you go, right from the horse's mouth.

http://www.tenergy.com/10002

From that page:

• Nominal Voltage (V): 8.4

Thank You both!

The multiple make sense.

I was looking for technical data on the Amazon page but it didn't show up.

I have previously purchased them and gotten the one I linked, that's why I recommend them.  Of course, they could change and send something else, but that would be unfortunate.