In GEL batteries, it would go up in voltage until it reached around 15v (about 4.4A) and you could hear bubbles inside. You would have to bake/dry the GEL batteries since they require less voltage. Since it doesn't have a button for the battery type, it requires manual oversight to not exceed the manufacturer's specs... for example, if the manufacturer gives a max charge voltage of 14.6, you should be above it to avoid any mishaps.

In lithium (lifepo4) with 30% charge, it gave up to 7.6 Amps max (from 13.1 it went to 13.2v) with the regulator at maximum.

At the time it was giving 7.6 Amps (measured with the amperemeter), its own indicator was showing around 25 hahaha... well, it's all over the place... The 50A it claims to have definitely doesn't exist and it's misleadingly sold as 50A. It's deceptive.