Gunrunner John,
I just ordered four of the 10500 original Battery Clip YLB Batteries with the 9-volt battery clip. I opened my 6-11210 1st run Vision Line Challenger tender and discovered it had the 9-volt clip, but on a different style plug than the 10510 new YLB Batteries I bought. Murphy's Law got me again.
It looks I will have to buy a supply of both the 10500 and 10510 as I put the YLB Battery in all of my steam engines. I bought three 10500 a while back, but they are buried somewhere in my "VERTCAL PILING SYSTEM". I am digging through the piles, but the ones I ordered today will probably arrive before I find those that are buried.
Sincerely, John Rowlen