How to Test a Sealed 6 Volt Battery

Written by mary lougee
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Sealed 6-volt batteries contain lead acid in them and are rechargeable. The sealed system prevents battery acid from evaporating and keeps the acid contained. Scooters use sealed 6-volt batteries for their power and safety, so if they turn over, the acid does not spill. Testing a rechargeable battery will help determine the holding capacity and if a new battery is needed.

Skill level:

Things you need

  • Adjustable pliers
  • Sealed battery tester

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  1. 1

    Turn the bolt on one of the battery cables counterclockwise with adjustable pliers to loosen the cable end on the battery terminal; pull it straight off.

  2. 2

    Turn the sealed battery tester to the "On" position.

  3. 3

    Observe the battery top to determine the polarity of each terminal. The negative terminal will have a "-" near it and the positive terminal will have a "+" sign near it.

  4. 4

    Place the black battery test probe on the negative terminal. Place the red battery test probe on the positive terminal.

  5. 5

    Read the display on the battery tester to determine how many volts the battery has stored in it. A fully charged 6-volt battery should read 6.2- to 6.3 volts on the display.

Tips and warnings

  • It does not matter if you remove the positive or the negative battery cable to perform the test.
  • If the battery tester does not show a reading, the battery is dead and needs recharging.
  • If the tester shows 6.2 volts and quickly drops, the battery is weak and needs recharging.
  • A 6-volt battery reading in excess of 6.8 volts that does not drop to 6.3 volts quickly is overcharged and needs to sit for several hours for the excess to dissipate. Check the battery again in 4-6 hours.
  • Batteries that test at a low voltage and then drop voltage quickly have an internal short in them and need replacing.

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