In checking my MTH engines, I need to replace a couple 9v rechargeable batteries. I did search for info on OGR about supercap BCR's, and sounds like there are good and bad things about them, one fellow complaining about the time it took for them to charge, and another about sudden stops, one fellow asking a question back in 2017 that never got a reply. The premade direct plug in 9v units seem a little pricey in the 20 and up range, when you can buy ten 5.5V supercaps for $1.84 each from Newark to roll 5 of your own BCR units. I have a couple locos with Eveready 9 volt rechargeables that had not been powered up in over 4 years (did not have broad enough curves to run them until recently) and found them at full 9 volt charge, so that is a bit of an argument to not switch to the BCR. I have one MTH loco that came with a BCR, and I found one with a regular 9 volt battery installed, glad it did not overcharge and break open. All my MTH stuff was purchased used, some from Trainz, some from online auctions, all except for one I did buy brand new.
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