As far as I was taught, the battery is only for starting the engine, which once running should power all the electrics and hydraulics.
Now if the fan belt or alternator were faulty, there lies a problem.
Get all the correct papers together, bank statements, bank letters, bank books, C o R, passport copies, Bht 1900...in and out in 30 minutes, with a re-entry permit if needed, at Phitsanulok.
WHO can be confused by what I have written?