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[quote user="rrebell"]It is very doable now and will be even better in future.[/quote] No company is going to take the risk to make a specific battery for this application.  You have a finite number of customers, say 200k world wide (there are other model railroaders, but they are going to stay with DC, DCC, AC, or DCC-direct radio/blutooth etc.  They are going to buy at the most 3-5 locomotives a year (probably more like 1 or 2).  Many of them have a fixed income.   If a company manages to make a battery that has a very long cyclic life, and is capable of several hours of at capacity discharge, and recharges quickly, there will be little to NO sales of replacements.  Its already a small market that is subdivided into many different control systems.   There is a specific amount of energy that you can fit into the finite space that HO and smaller scales have.. you mentioned Moore's law.... Google Moore's law and you will find that within 10 years the ability to cool the transistors in an integrated circuit will reqire more energy than can flow through said tranisitors.  Kind of like there is a limited number of times you can fold a piece of paper. [quote user="rrebell"](why do you think they built the gigafactory, it was not built to build todays car batteries even though a small portion is being used for that now)[/quote] Tax break... [quote user="rrebell"] Running time is about 2hr max but in reality, how long do most of us run a single engine[/quote] 4-8 hrs a day for 3 days straight, under full load conditions, electricity in building is shut off at night. [quote user="rrebell"] remember that battery tecnoligy is ever changing and will jump at some point.[/quote] And model railroading is a huge industry that will see millions a year in battery sales... yeah probably not... so we will have to wait until someone puts an off the shelf battery into a locomotive.  And I still wont buy it.  Because the battery (likely) wont exceed the life of the LEDs in the locomotive, so I will still have to take the thing apart.  For HO scale model trains...its a solution in search of a problem.
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