Step By Step Guide Of Charging An AGM Battery

- May 26, 2020-

The step by step guide or instructions below is not only the proper way of charging an AGM battery. It can also be applicable in charging an almost dead battery to get back on track and keep it healthy. Giving it the opportunity to deliver the optimum performance still that it is expected to deliver. So, to be familiar with this correct way of charging make sure to keep these steps in mind.


NOTE: The process below will require you to charge your AGM battery with the help of another fully charged battery.



Lithium Iron Phosphate battery to replace AGM battery:

6.4V3.4Ah-300

Model: PLFP0603

SPEC : 6.4V3.4Ah

Structure: 2S1P

Cell Model: IFR26650-34A

Size (L*W*H) :70*47*101mm

Weight: 0.3Kg


Step 1 – Use the Jumper Cables to Connect the Batteries

The first step in properly charging an AGM battery is to use jumper cables to connect the discharged battery with the good battery. The connection has to be a parallel connection where both the positive terminals of the batteries are connected the same way as the other.


Failing to establish this connection will lead to failure of the charging process. This first step will also prepare your entire connection for the following step and to make sure it will be successful.


Step 2 – Connecting the Good Battery with the Battery Charger

uisng the right charger to power up your cells.Now, the next step that you have to take is to connect the good battery with your battery charger and make sure that you have a solid connection. Then turn on the battery charger and let the good battery receive the direct charge from the charger and let it provide the current that the discharged battery needs to start storing the charge it needs. This is a safer way to charge an AGM battery because it will keep it from overcharging.


Step 3 – After Leaving it for An Hour of Check the Battery

After leaving the batteries for an hour of charging, you can start to check the discharged battery to see if it is warming up. Charging batteries have the tendency of becoming warm when they are charging.


However, you have to keep in mind that excessive heat is an indicator that there is something wrong with the battery. Checking the battery if its warming will make sure that the battery is starting to take in the charge.


Step 4 – Use A Voltmeter to Check the Discharged Battery

Finally, you will have to use a Voltmeter to check if the discharged battery is already charged and it at least has 10.5 volts of charge stored. If the battery has been charged, you can leave it for awhile to let it charge for more. If it didn’t take any charge, then it means that there is something wrong with your battery.


Final Thoughts

That is how to charge an AGM battery when it is almost dead. By following these steps, you will have a much safer way of charging your battery by keeping it from being overcharged. So if you have an AGM battery that is almost completely discharged, make sure to follow our steps.