QSI QS-2plus!, Manual

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Appendix IV System Description and Hardware Adjustments 120
Recharging the Battery
Put your engine on a powered track in neutral and turn the throttle up to 12
volts for about fifteen minutes. If the battery comes back to life, you may not
have a worn out battery. You will want to give your battery a full charge by
leaving your engine powered up in neutral for not less than 12 hours or more
than 24 hours. If the engine is unattended, lock-out your engine in neutral or
de-select it so an accidental power interruption will not start your engine
running.
You can also remove your battery from the engine and recharge it using a
commercial battery charger.
If you do have a bad battery, you can substitute a standard 9v alkaline battery as
a
temporary fix. Since alkaline batteries will not take a charge, it will
eventually wear down but you should have anywhere from a week to a couple of
months of use. This will give you a temporary back-up to run your engine while
you order another NiCad battery from QSI.
Note: Do not store your engine with an alkaline battery installed since the
battery may leak and cause damage to your engine. NiCads are dry batteries
and should not leak corrosive chemicals.
Replacement 7-cell, 8.4 volt NiCad batteries are available from QSI and some
electronic parts stores.