STANLEY BC2509 25 Amp Automatic Battery Charger for Car, Truck, SUV - Fast Charging & Maintenance Mode for 12V Lead-Acid Batteries - Perfect for Home Garage, Road Trips & Emergency Power Supply

This is my second unit. I also had a few issues with the "Anderson Powerpole" DC connector on the cable, which just got tired from lots of use and became high resistance (would get hot during charging at high amperage). I replaced the connector. The first one lasted many years before the fan went out, so I installed a new 60x20mm fan but this was too high current and burnt out the high speed fan driver. My fault completely. I connected the fan to external 12V power. Shortly afterwards the unit stopped charging completely.I purchased a new one. The fan is still the Achilles heel of the unit, but it works. The OE fan is a XINRUILIAN RDH6020s, 12v 0.25a 60X20MM.I charge a wide variety of batteries with this. It charges my wet cell 48V 220Ah boat (including charging the six volt batteries individually when needed), my AGM 235Ah 48V buggy (I wish it had an 8V charger mode), lots of 12V AGM, and also plays well with some Dakota Lithium LIFEPO4 12V 10Ah's BMS.I also confirmed this is a temperature compensating charger, probably based on ambient air flowing into the unit. It does have charger over-temp protection.If I had any advice for Stanley on the next generation of this device:Make battery chemistry settings persistent between power cycles.Make voltage sensing come from leads at the alligator clips instead of internal (voltage drop on leads charging 6V batteries is significant and not fully compensated for).8V charging mode (even if its manual only) for GC8 batteries.A true CV float mode that can match loads.