Corrected Specific Gravity = Msp + (Temperature - 20) X 0.0007; Charging Capacity Test - TOHATSU NB-1000 Service Manual

SECTION 7
Testing
1. Check electrolyte level.
2. Check specific gravity using a hydrometer.
3. Note temperature of fluid or ambient air (in celcius).
4. Calculate corrected specific gravity using the following formula:
Corrected specific gravity = MSP + (temperature - 20) x 0.0007
Where: MSP = measured specific gravity
Temperature = Temperature in degrees celcius
5. lf the corrected specific gravity is less than 1.260 or differs
between any two cells by more than 0.030, perform the charging
capacity test.

Charging Capacity Test

Whenever recharging battery, always remove ALL
filler caps.
Remove battery from boat whenever charging
When removing battery cables ALWAYS remove
the negative cable first.
1. Check electrolyte levels.
2. Test specific gravity.
3. Calculate amount of discharge in ampere hours.
4. Calculate charging current.
5. Calculate time required to recharge battery.
6. Charge battery.
7. lf electrolyte temp exceeds 115°F (45°C) or gassing becomes
excessive, life of battery will be shortened.
8. lf battery goes to 13 volts immediately upon starting charge,
replace battery.
9. Good battery should start at 12 and rise to 12.5 or 13 over the
period of 30 to 60 minutes.
10. If little or no gas is produced during charge, replace battery.
11. When charged, battery should measure 15-16 volts and have a
specific gravity of 1.260.
7-18
WARNING
WARNING
WARNING
1-/ 2-Cylinder