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Oh dear,
If you have a single 3.6 or 3.7 V cell then yes, it is mandatory. If not i.e. you have a 4s configuration, I do not think so.
I do not know the exact voltage at which the electronics will barf out the magic smoke. I only have some unreliable bits of information.
At the auto industrial zone a guy one sait you ar good up to 16V.
Some racing guys run a higher voltage battery to speed up the fuel pump and get faster injector response.
+ on a VW forum a guy was having battery problems. Turned out to be that the charging circuit hat failed and was pumping out 22V. The car was acting funny but did not suffer major damage.
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