Re: How do you know which type of battery you have: Gel, Flooded, Sealed?
If you can remove the caps and see "water" (actually acid) then you have a FLA . More than likely that is what it is. Be careful around FLA batteries (any battery for that matter!) Errant sparks while charging can trigger a hydrogen explosion, as can accidental shorts between positive and negative posts.
Acid will burn through your clothes if you spill some on them, and it can blind you if you get it in your eyes. Wear safety glasses!
For all you need to know about batteries,
Please note, being a moderator does not add any weight to my opinions 300 watts Siemens/BP panels,plus a Sun 90,, making ~400. ~30 amps into Rogue MPT-3024, 450 ah of Trojan T-105, Morningstar ts300 inverter, a Tri-Metric meter.a collection of antique generators, plus 2 Honda eu-1000i's (also a BS2512 IX controller) and assorted other stuff!