An average car battery has a capacity of around 48 amp hours which means that, fully charged, it delivers 1 amp for 48 hours, 2 amps for 24 hours, 8 amps for 6 hours and so on.

## What should a battery charger read when fully charged?

When Fully Charged, How Many Volts Should A Car Battery Have? Fully charged automotive batteries should measure at **12.6 volts or above**. When the engine is running, this measurement should be 13.7 to 14.7 volts.

## How many amps should a car battery have when off?

Most vehicles draw some battery current when the key is off, thanks to the clock and the internal memory of engine computers, body-control modules, and radio presets. Altogether, they draw a very small amount of current. **Fifty milliamps** would be a safe upper limit for this, though many vehicles will draw less.

## Can you overcharge a 12 volt battery?

**It is safe to charge discharged battery** (less than 12.4V) at whatever voltage. Whatever device you use to charge it (12–25V) will not be able to raise the voltage if it doesn’t have enough output power (amps).

## Is 11.9 volts enough to start a car?

The normal voltage needed to start the car begins from 12.6 volts. At the time of exploitation, this parameter is between **13.7 to 14.7 volts**.

## Should I charge my battery at 2 or 10 amps?

It is **best to slow charge the battery**. Slow charging rates vary depending on the battery’s type and capacity. However, when charging an automotive battery, 10 amps or less is considered a slow charge, while 20 amps or above is generally considered a fast charge.

## How long does it take to charge a car battery at 2 amps?

A car battery is typically 48 amps. This means that a 2 amp charger will take **24 hours**. A 10 amp charger, on the other hand, will take 5 hours. For a car battery in most cases, it is okay to use a 10 amp charger and is normally the recommended amount.

## Can you overcharge a car battery?

Can you ruin a battery by overcharging it? **Yes**, overcharging a car battery can easily damage it beyond repair. Once a battery reaches its full charge level, the charger’s excess current breaks down the electrolyte. This process releases oxygen and hydrogen.

## Is 300 amps enough to start a car?

**Smaller engines will need about 300 amps to jump-start the car**, whereas bigger ones will require 1000 amps. If you do not have a jump starter around and wish to jump-start your car using another motorist’s battery, you should also confirm the amps of their batteries.

## How many amps does a 24 volt battery have?

Most battery manufacturers recommend sizing the charger at about 25% of the battery capacity (ah = amp hour capacity). Thus, a 100 ah 24 volt battery pack would take about a **25 amp** 24 volt charger (or less).

## How many amps does a 1.5 volt battery have?

I=1.5volts / 0.15 or 0.3 = **5 to 10 amps**! A typical alkaline or NiMH battery in the standard “AA” size has about 2000 to 3000 mAh (or 2 to 3 Ah). With a cell voltage of 1.2 V to 1.5V, this corresponds to 2 to 4 Wh per cell.