MTH has 2 systems using a battery. The older version is protosound 1, and some of them have known to scramble the processor when the battery is low. Protosound 2 also has a battery, but it won't damage the electronics if it runs low. However they do need a charged battery (both systems) to work properly and it will be recharged when running above 12 volts or so. Locosound doesn't have a battery.
A battery can stay in the engine about 5 years before it's not able to hold a charge anymore and that is only for the Nicad type battery's. Nimh type batteries have a much better performance and will last several years longer. Note that both batteries will have to be recharged BEFORE operating the engine though, since both batteries loose their charges within a few months after use.
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