Review on Efficient Sunforce 58104 3.5W 12V Solar 🔋 Battery Trickle Charger with OBD-II Connector for Optimal Charging by Scott Lavimodiere

The PV modules appear to be fine, but I really don't like that they are advertised as having "overcharge/discharge protection built in". As for discharge I'm not sure (I'll measure when I get a chance) but it happily pumped over 15 volts to a fully charged battery. This is too much and over time will cause the electrolyte to boil off and/or corrode the grid. The only "protection against overcharging" seems to be its negligible performance.