According to the Braun manual for your 5414 Contour, the specs for charging are printed on the electric shaver cord plug. (it's REALLY small print, so I'd get a magnifying lens to look at it!)
There isn't anything in the manual about the multiple voltage for charging the shaver, so I'd have to defer to the Braun (Gillette/Proctor & Gamble) customer service folks to make absolutely certain of what can and can't be used as a charging voltage before trying.
Here's a link to your manual, in case you're missing yours.
http://www.retrevo.com/d/ds/progress?doc=9142c4ae65df1746d12fc67fdc01df52
You can ALSO reach the Braun Customer Service folks by calling them at 1-800-BRAUN 11 (1-800-272-8611)
I hope you find this Very Helpful and best regards!
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