Car not starting without battery booster (New Battery)
Hi,
I was trying to start the car with a old battery, it's sat around for a while so didn't expect much. i used a battery jump booster which works to move it about the garage. The car will start but doesn't start without it.
Today i bought a brand new battery. Calcium, 60amps 550 CCA, this doesn't start the car neither. it just clicks and the lights on the dash flicker.
Again, if i connect a battery booster it will start.
The battery is off the shelf, there is a chance it's lost charge while on the shop floor or maybe it's a dead battery although the battery indicator is showing green.
Going to try another known working battery from another car but if that doesn't start the car without a battery booster, where am i going wrong?
I've checked the ground behind the battery, the one connected to the gearbox and the other one connected to the head from the bulkhead. I've checked both ends of the grounds and cleaned with a wire brush.
Really baffled, could be a faulty battery although it's brand new.
What is the recommended amps and CCA for the NSX?
I have a battery Tender Jr connected to the battery overnight and will try again in the morning but my understanding is that battery tenders don't actually charge the battery as such?
Thanks 
