Hi Vegas. I went through this a while back concerning my Dad's (1915-2011, R.I.P.) 24 Volt wheelchair battery. The battery consists of two 12 volt 34 Ah AGM batteries in series.
The Junsi chargers do utilize the proper CC/CV algorithm for charging Pb batteries. One thing that may be of concern, is that if the Power Wheels uses a "gel cell" battery, as I recall, a slower rate is recommended than for typical wet cell, or AGM batteries. In my case, I was limited to a 1/10 C rate anyway, due to the small wires I used.
I'm pretty sure there is discussion about this, as well as charging Pb batteries in general, in the
huge Junsi thread over on
RC Groups, if you want to check it out. I punched in "Pb" in the "search this thread" function and came up with a gazillion hits. Perhaps a more precise search parameter would yield fewer results.
Dave