how to build a 18 volt lead-acid battery charger?

I want to build a 18 volt lead-acid battery charger for my sons Minimoto Honda. A new charger is $50 and I was wondering if anyone had ever built one from Radio Shack parts?

bob2008-08-10T14:21:38Z

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Will this do it!
http://www.instructables.com/id/DIY-Lead-Acid-Battery-Charger/

dlabaj2016-12-12T23:55:06Z

Honda Mini Moto Battery