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2 things, Batteries do self discharge, and an RV battery will require 3 to 5 days of chrging 24 hours a day to charge completly. The.08 volts per hour is interesting, but this drop is going to be dependent on the charge level in the battery. The Number normally used is amperage draw. The LPG detector will draw 50 to 400 milliamps depending on the make model etc. (= to.05 amps to.4 amps) This detector alone will kill a fully charged battery in one to three weeks. So the valid test is to fully charge the battery, check the charge level with a hydrometer. Then disconect the battery completly and retest in a day or two. If the charge continues to disapear, bad battery, if it doesn't hidden draw on the unit. And finaly if the furnace cuts in more than a couple times in the night it will kill the battery, 8 to 10 amps draw for a twenty minute heat cycle several times in a night and the battery will be dead. Good Luck |