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10-12 volts is optimum, however, more up to 21 won't hurt.quote:I wanted to make sure the 21 volts wasn't going to create problems.
How long should I let my PS-2 battery charge before attempting to run the engine?
Neal Jeter
You won't cause any damage by running it with a low battery, unlike some PS/1 engines. It may not run right, or at all, with a low or dead battery, but after charging it, it should run fine.
Thanks. I let it charge for about two hours and the engine is operating normally.
Neal Jeter
Neal,
Run the engine and occasionally check the battery with the DCS Remote. It takes about 12 hours to charge the NiCad battery.
Neal,
It only take 10 minutes max to install a BCR in most any engine.
PCRR/Dave
Take another 10 minutes and whack yourself together a BCR clone and save some money as well. 
John,
Have you a diagram of the clone?
I recently bought the MTH external charger. It cured two engines that were acting up. All my ps2 engines have the original batteries still inside with no failures. Some are near ten years old. I would highly recommend the charger for anyone who has engines that don't run often.
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