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The Right Technician Is A Licensed Technician
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Determining A Battery’s State of Charge
Difference between a Power Supply and a Charger
Power Supply: Provides power to electronic equipment
Charger: Charges storage Batteries

The Standard AC to DC Power Supply converts an electrical current to a constant voltage and
current output with Over-voltage Protection and Over-current Protection.

The Standard Charger provides a controlled voltage that is higher than the battery voltage in
order to charge it, and controls the charging current. The voltage changes as charging nears
completion. The chemistry of the Rechargeable Battery or Battery Pack determines the type
of charger:
* Lead Acid Charger (Pb),
* Nickel-Cadmium & Nickel-Metal Hydride Charger (NiCd/NimH),
* Li-Ion Battery Charger (Li-Ion),
* Lithium-Iron Phosphate Battery Chargers (LiFePO4).
As batteries age, the "state of health" tends to degrade in many small ways which, generally, add up to a loss in capacity. This problem manifests itself when we have a battery which claims to be fully charged, but runs out of power much more quickly than it should. A battery with a particularly poor state of health may in fact charge to 100% - but only at 20% of its original capacity. To the state of charge indicator, a 100% charge is a 100% charge - it doesn't "know" that the capacity is reduced.

CCA is how much current the battery can supply in a short amount of time.

Cold cranking amps (CCA) is a measurement of the number of amps a 12-volt battery can deliver at 0 ° F for 30 seconds and not drop below 7.2 volts. So a high CCA battery rating is good especially in cold weather.

Amp-hours is how long the battery can output a current at a certain rate.

An amp hour (AH) is a rating usually found on deep cycle batteries. If a battery is rated at 100 amp hours it should deliver 5 amps for 20 hours, 20 amps for 5 hours, etc.

Dynamic Internal Resistance is the resistance within a battery, or other voltage source, that causes a drop in the source voltage when there is a current.

Battery 1: Good battery. Capacity and CCA are high. Dynamic Internal Resistance is low.
Battery 2: Defective battery. Low capacity but ample CCA. This is a common failure.
Battery 3: Defective battery. Low CCA with ample capacity. This is less common.
Battery 4: Defective battery. High dynamic internal battery resistance

CA is cranking amps measured at 32 degrees F. This rating is also called marine cranking amps (MCA). Hot cranking amps (HCA) is seldom used any longer but is measured at 80 ° F.

Reserve Capacity (RC) is a very important rating. This is the number of minutes a fully charged battery at 80 ° F will discharge 25 amps until the battery drops below 10.5 volts.