Freaken Rat. Currently reduced to yard duty. The battery is from my last 528e and about a yr old I plug in the 1/2 A floater at least monthly. Cables are clean and tight. When the truck has warmed up for 10 minutes, idle is down to 900RPM. I put a meter across the power port. 15.1 V. A couple hrs, later I checked the battery voltage, 12.67 V. That is nearly a 100% charge. Resting draw is <25.mA. so the floater is definitely not really necessary if the Rat was used more. Should I be checking the water level in the cells? I want to keep the battery as long as possible. I hope to put it into another old BMW in a yr or so.
'16 Camry LE STP synth 0w20 and STP filter. the Fridge
1994 Ranger ,the Rat, 5w30 dino, STP filter
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Thick oil is better