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I have a yellow top and because it wasn't used enough whilst building the car it sulphated and wouldn't allow it to be charged by a Ctek or Projecta chargers. It show error light evrytime. The shop tested the battery and it showed 1000 cca but sulphated? I now use a cheap 1.6 amp auto charger and it charges ok. I have seen on youtube where they use an old fashion transformer type charger to overcharge the battery to bring dead batteries back to life.
JD
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