Every couple of years or so my OEM NSX battery just decides to pack up and not crank over and as Kaz witnessed yesterday at Silverstone, it was so flat in fact it barely brought up the dash lights and that was immediately after 3 parade laps and a very long drive getting there.

When parked in my garage I always make sure that the CTek digital pulse charger is plugged into it so ready and maintained for its next outing.

Once again Yeomans will kindly change it under the battery warranty but it's still very mystifying.

Today I put a volt meter across the terminals once removed and it read a low 10.31v
The condition warning light glowed a bright green colour indicating a healthy battery.

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Yet when I used my drop tester it fell instantly into the poor black section, suggesting knackered although still glowing green.

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Any suggestions as as to why this should happen so consistently???