its highly unlikley your battery has failed, its 99.9% certain you have blown your speedo, its also highly unlikley any manufacture will honour any warranty, as its user error, and most modern speedos are unrepairable, most simply supply a new one. sorry to be blunt but you need to clearly mark you wiring or make it impossible to connect the wrong way round.
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD
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