The Miata alternator system alone will often not bring the battery back to full charge. If you try and charge it like a wet-cell battery, you will destroy the battery.Hmm, that's what I said, and is not in agreement with what you posted.įrom the second link Now you'll almost for sure start, and then put your 2-amp charger on when you get home. If your battery will not crank the engine, you should charge the battery at a rate of 1 amp or less for 18-24 hours. That's also why a boost and then driving for a few hours will NOT properly recharge an AGM battery, where a 2A trickle charge for 24+ hours will.Then MrSS listed three links to articles -įrom the first link The AGM batteries require a lower charge rate, for a longer time period. If it doesn't charge it fully, throw the battery awayI disagreed entirely with your statement, and said Because of the nature of the AGM battery, a trickle charge for a long period is required. According to the chart in the service manual, it will take 10.5 hrs to fully charge your battery. Thanks for answering Gordon's question.Bill, I'm afraid he's done that, but not in your favour. Next time your flashlight batteries die measure the voltage - should be about 1.5 volts - But the batteries are dead. It would require the appliation of a load to determine if the battery provides proper levels of current flow. They will read proper (or full) voltage right up until the point that they 'give up the ghost'. More likely the 'expert' wan't so much of one and measured the voltage 'backwards' resulting in the reading.įYI - battery 'charge' can't be accurately measured with a volt meter. I've never heard of a battery being charged 'backwards' as battery design should prevent this from happening. Unless of course your experience at the car lot was back in the 60's when there were many 6V offerings in autos and would have required the use of a 6 volt charger.Īs for 'charging the battery backwards' - if that was the case he should have just turned the battery around and put it back in the boat. I do know that some deep-cycle batteries don't take well to fast charge times (like the Miata AGM battery) and require longer charge times at lower current levels which could explain the lower current levels being used but not lower volage. Personnaly, I've never seen this done and can't explain why it would work. It was.Halving the voltage applied to the battery cuts the power in half given the charge is still at the same current (Ohm's law). I had to hear that right from the expert because I never thought it was possible. The Mercury dealer determined that he charged the battery BACKWARDS and it was actually -13v. He called me in and I couldn't figure it out. Are they crazy?Īs a interesting side note, this guy charged his boat battery to full 13V with a 1 AMP charger. I have also seen people do this with boat batteries. I was told it 'halved' the AMPS of the charger.
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