Replacing AROMA 3-FM-10 Gel Batteries in a 12V Toy Car: Compatibility with AGM 12V 20Ah & 6V 14Ah

Hello
For a year, my son is a happy owner of a car for 2 gel batteries, stapled and car has 12V engines. Batteries are: AROMA 3-FM-10 (6V 10.AH / 20HR). As the batteries were new, after charging the car even went for 2 hours. Unfortunately, these batteries are over and it is high time to replace them. There is also a charger for the car: Model: FLH580608 - 12V - 1000mA.
And now the question:
Will this charger handle a higher capacity battery, eg AGM 12V 20Ah?
Possibly, as now, two 6V batteries with a capacity of 14Ah each?

pszczolap wrote:

Will this charger handle a higher capacity battery, eg AGM 12V 20Ah?

It will deal with a larger battery - unfortunately, charging will take much longer - in an extreme case almost a day.
If you want faster charging, then buy a charger with 2x more charging current.

Xantix wrote:

If you want faster charging, then buy a charger with 2x more charging current.

I am very much for the purchase of a specific charger. What charger should I buy so that Son would be happy and that the batteries last as long as possible?

Yes, but without exaggeration - the current charger has 1 A and charges 10 Ah batteries - that is, the maximum current is about 0.1 C. However, as it increases the capacity of 2x, and the increase of the charger's 2x does not hurt - the proportion will be maintained - the charging current will not exceed 0.1 ° C. This value (10% capacity) is usually taken as the best ratio between durability and charging time.
What to charge - a good option is to use eg such a charger:
www.akumulatory24.pl/2Fyuasa-yu-power-ypc2a12-p-163.html

Two, that the lifetime of aku not only affects the way of charging, but the operation in general. First of all, you should not unload the batteries deeply, ie to the very end and they should be recharged as often as possible - just the gel batteries like to be fully charged at all times. And of course, after the discharge, the battery should be recharged as soon as possible - each delay with charging causes the plates to sulphate and the battery deteriorates.

This AROMA 3-FM-10 is not a gel battery, although in fact for such work (cyclical deep discharge), a real gel battery would be better suited. It would also require a suitable charger with a lower charging voltage of 14.1V.

OK. In that case, what battery, or what batteries and which charger to buy to the young driver was satisfied. Until now it was so that the driver rode, the power dropped and the car was loaded from the afternoon until the next morning. After kindergarten, driving for 2 hours and recharging. So it has to be good, and even better as it was.

pszczolap wrote:

In that case, what battery

It can be like this:
https://www.neoled.com.pl/akumulator_agm_20ah_high_performance.html
And the charger can be like this:
http://www.yuasa-akumulatory.pl/ypc2a12-ladowarka-12v-2a-p-135.html
Such a set should please you.

I almost bought it, but something touched me and it turned out that AUTKO has limited capacity under the hood. There may be a brick with dimensions of 100x150 and 170 tall.
I will look tomorrow, maybe something can be cut under the hood to increase space for batteries: /

That's why I did not advise you because I assumed that space and dimensions are limited.
I would buy two sets of batteries after 6V and when the first signs of discharge appear, he exchanged for the second set. Do not allow deep discharge, because it primarily kills them by sulphating.

Wlodek22 wrote:

... Do not allow deep discharge, ...

Is there any voltage testing system that will not allow them to be over-discharged? Because knowing the life, the son will ride until the car stops going: / Then he will come and say, "Daddy, charge!

The simplest one I know is a relay of the right size to withstand the current load with a coil supplied from the accumulators through a resistor. Resistor resistances choose experience, resistor power about 5W. The resistor can also be connected behind the relay, so that after cutting it does not discharge the batteries further. For switching on in this case, a button will be useful, which will energize the relay coil directly from the battery. The cut-in voltage should be set to approx. 11V.

There is - look on google: "gel battery protection before deep discharge".
Example solution:
https://sklep.avt.pl/avt1533.html

All right - it's time to sum up:
- I bought aku 12V 14Ah
- I bought a gel battery charger
- I bought the aku protection against deep discharge
I think that around Friday - Saturday I will send photos and I will answer how it works.

I already have all the necessary elements of the puzzle, ie: battery, charger and protection. Now a technical question arises.
How to connect the protection against deep discharge?
I mean a place. Is it supposed to be directly on aku? Can the charging current pass through the protection? Can the charging connection be made between the protection and the battery?
What voltage can be safely discharged AGM 12V 14Ah GEL BATTERY?

pszczolap wrote:

Can the charging current pass through the protection?

It depends on the construction of the security.

pszczolap wrote:

Can the charging connection be made between the protection and the battery?

You can do it this way - the security does not take part in the charging process anyway.

pszczolap wrote:

What voltage can be safely discharged AGM 12V 14Ah GEL BATTERY?

It depends on the load current. For soft loads, 10.5 V final voltage is used. I still would not advise you to go below 11 V. Deep discharge will drastically shorten battery life - so it's better to recharge it more than to "suck" to the end.

Ultimately, I bought a BT-02-109 12V 14Ah 20 HR battery and an intelligent digital charger. Moonlight model v4.2.
Thanks for the hints.