Electrical Engineering Asked on December 12, 2021
I want to charge a couple of small (1Ah 12V) sealed-type lead-acid batteries. I have a Bosh KL 1204 car battery charger. The charger’s nominal current is fixed at 2.3A, while on my batteries it is said “Initial charge current <= 0.39A.
Is it possible that I use the said charger for the said batteries? If so, what are the steps to modify the charger to suit the batteries?
As many members here have explained in depth about the charging process I’m not going to re explain it again. But to say in simple terms don’t use the charger you have. It will destroy the batteries in no time. I have had made this mistake in the past. It’s a matter of time before the lead plates breakdown and settle to bottom on battery case causing a short to occur. If you see the leaflet that’s comes with the small lead acid battery you will see the manufacturers say that you should charge at C/10 regularly and for an occasional fast charge C/4.
In your case C/10 would be (1000mAh/10=100mA charging current) is the recommended one. Btw 1Ah=1000mAh.
If you want some good life out of it you might want to stick with this rate. Get a 12V charger with this rating or even a cheap bench top power supply (you can easily find on eBay) can get the job done. But I think you will have a hard time finding a charger below 500mA or 1000mA at 12V.
Answered by The_Vintage_Collector on December 12, 2021
I want to charge a couple of small (1Ah 12V) sealed-type lead-acid batteries. I have a Bosh KL 1204 car battery charger. The charger's nominal current is fixed at 2.3A, while on my batteries it is said "Initial charge current <= 0.39A.
As your charger was designed for a car 12V battery, it has same voltage parameters for your tiny 12V battery.
So most probably YES you can charge using this charger if and only if you limit the charging current to the battery.
You will need to adapt & check a few steps:
Answered by EJE on December 12, 2021
I have used a simple method for a number of years, Connect a 2.2 Watt (12Volt) dash board type lamp in series with the battery on a 12 Volt charger, The light limits the current and indicates what is going on.
Answered by Fred Anderson on December 12, 2021
The easiest thing would probably be to use something like a LM317 because of it being cheap and its quite low maximum current. If you can find an internally limited regulator limited at a lower current, that would be even better.
Answered by Gunnish on December 12, 2021
$$ mathrm{2.3 A > 0.39 A} $$
End of story.
Whereas other rechargeable batteries most often use a fixed current, lead cell batteries are charged with a fixed voltage, combined with a current limiter. Usually current limit is 1/10 of the battery's capacity (/h), so a 1 Ah battery is charged at 100 mA maximum. You can use the charger if you place a 100 mA current limiter in series with it.
Answered by stevenvh on December 12, 2021
Is it possible that I use the said charger for the said batteries?
No, the car chargers current will likely damage your battery.
If so, what are the steps to modify the charger to suit the batteries?
In theory, a resistor or incandescent light bulb in series to the battery could work. I however suggest charging the battery by connecting it to a constant voltage (13.8 volts for a 12 V battery). A bench power supply then can limit the charging current to 0.4A.
This method is obviously simple but comes with a price: It is slower than other methods and can decrease the batteries capacity over time. But I really like it because you don't have to worry about overcharging the battery.
Answered by 0x6d64 on December 12, 2021
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