My Playmobil based RC locos, use a 4 x AA battery pack. I have a proper one, but thought it would be good to have a spare one with another set of batteries in it; so if the batteries run down during an operating session I can put the spare in and carry on..
I used a standard 4 x AA battery holder fwhich its into the loco as needed with the +/- contacts pressing against the loco ones. To stop it falling out some small spacers 'dots' are fitted; to remove it a small self adhesive wall hook is fixed to the other end. I have to paint the hook black.
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