MarkGolfOnly just read this, I had a similar thing, car on a CTEK for extended period, car would just clunk.. then after some tried, get lucky and fire. I noticed I would never have this problem after a run or days after. It was just being sat for a long period that I would get this. I performed all sorts of tests and found that the battery would just be under 12v on occasion and this would result in the non start. If I put jump leads on with another car connected, fired up instantly. Battery performed fine in all tests by a garage. It would be interesting, that when your car does this, if you join another car/jump leads, does it fire instantly or not. During all of this, I had changed the voltage reg on my alternator also as I heard these can cause issues with drain. I still got the issue once after changing this so I'm not sure it did anything for me but I definitely noticed the car didn't respond well to long periods of not being used even with the CTEK.. All my earths were renewed/cleaned, starter solenoid inspected etc. My next option was a battery with more CCA.
geedeeNothing wrong with clutching at straws Les.Chargers come in a variety of types, the ideal for seldom used cars would seem to be the float/conditioner type of chargers that sense the battery voltage and adjust the charge accordingly to bring it up to the ideal voltage.As for the TIME it might take to get up to full voltage that is dependant on a few factors though primarily the maximum charger output.The age/condition of the battery is key in terms of it`s ability to retain charge over TIME, A battery may read well on a voltmeter but as soon as a load is put upon it, the voltage can drop off considerably, and no more so than when trying to crank the engine over. I have two CTEK chargers, one for ordinary old style wet lead acid batteries, and the other a newer version which can charge and condition either ordinary wet lead acid batteries, or the newer type Advanced Glass Mat batteries as will be found in vehicles with stop/start operation...As best I understand it the AGM batteries if fitted to an air cooled or similar age machine, will never get up to full charge as the AGM max is a higher voltage than the older led acid type, thus the alternator`s inbuilt voltage regulator will have a max voltage setting lower than the AGM type battery`s max voltage.. Similarly old style float chargers may also not bring an AGM battery up to a fully charged state..?
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