Can I mix battery sizes?
We strongly recommend you DO NOT attempt to mix battery sizes (amp-hours) and connect together. This will cause the highest voltage battery to charge the lowest voltage battery attempting to create balance in the circuit. The greater the difference in voltage, the higher the probability of battery failure.
What do the numbers on batteries mean?
Nearly all automotive batteries have two sets of consecutive numbers at the top of the battery. One row of numbers is meant to signify the last digit of the year the battery was purchased (such as “7” for 2007, or “9” for 2009). The other row is meant to signify the month of purchase.
How do I know when my 12-volt battery is fully charged?
A fully-charged 12-volt battery, allowed to “rest” for a few hours (or days) with no load being drawn from it (or charge going to it), will balance out its charge and measure about 12.6 volts between terminals. When a battery reads only 12 volts under the above conditions, it’s almost fully depleted.
What does it mean to have two batteries in series?
This means that if you have two batteries in series of the same voltage and amp hour capacity that you have been using for a while, but replace one with a new unit, what you have in reality is one battery with a higher voltage and amperage (the new battery) than the other older battery.
How many volts are in a series battery pack?
Figure 7Two Batteries in Series, Two Chargers Figure 7 shows two 12 Volt batteries connected in series. The resulting battery pack voltage is 24 volts. As you can see, each battery is connected to a single 12-volt charger.
Can a car battery measuring 12.4v still be knackered?
12.7 is a charged battery. 12.4 is knackered. Most motor factors and Tyre companies will do a free battery check. As Trail Rat said – 12.7 is charged, 12.4 is dying. As above. 12.8 is normal. 13.8 is typically fully charged (on charge).
What should the voltage be on a 12 volt battery?
A 12-volt battery will read 12.6 volts or higher after charge; a 6-volt battery will read 6.4 volts or higher after charge. Make sure the battery terminals are free of corrosion before testing. Batteries must be at 100% voltage before a load test can be applied.