Carging SLA batteries

I recently bought a small trickle/float charger that can charge batteries from 15AH to 150AH (at like 13.5vdc).

Would it be safe to use it to charge my 12v 4.5AH SLA batteries with it? If i put them in parallel, or is that not a good idea?


I know one battery is in good condition, but i am not sure sure about the other one... i plan on buying 2 brand new SLA batteries soon (for random projects)

or should i buy something like this? **broken link removed**

Putting SLA batteries directly in parallel is not a good idea. If you do, diodes for isolation is recommended, then you have to increase the charge voltage of the charger.
Here is a old thread that has a lot of information:
https://www.electro-tech-online.com/threads/questions-about-power-storage.36436/

ok. thanks. I will charge one at a time,,,

will my float charger work?

Marks256 said:

ok. thanks. I will charge one at a time,,,

will my float charger work?

Click to expand...

I question that it will be suitable unless you monitor the charge voltage.
If it never exceeds 13.8V it will work fine, but if it exceeds 13.8 it must be removed when the charge current = the capacity of the battery/100.
For a 7AH battery this is 0.07A. If you don't remove it the battery could become overcharged.