Acura NSX 1991 Manual page 740

Main Menu
Apply 300 amp load for 15 seconds to remove surface charge.
Allow 15 seconds recovery period.
Apply test load (see Test Load Chart).
Record voltage at the end of 15 seconds.
Stays above 9.6 volts; battery is OK.
80D26L-MF
BATTERY CODE
Table of Contents
Charge on High Setting (40 amps)
Charge until EYE shows charge is OK; plus an
additional 30 minutes to assure full charge.
NOTE: If the battery charge is very low, it may
be necessary to bypass the charger's polarity
protection circuitry.
If the EYE does not show charge is OK within
three hours, the battery is no-good; replace it.
Write down how long the battery was charged.
Test Load Capacity (#2)
Drops below 9.6 volts; battery is no-good.