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flyingfarmer's avatar
flyingfarmer
Explorer
Mar 11, 2015

new battery voltage

Just purchased a new Everstart Maxx 24DC battery for my crusader 295. It has a 3/15 sticker so it is a fresh battery. I placed it on workbench when I got home and checked voltage. It read 12.5 volts. I put a commercial charger on it and charged for 90 minutes. Charger set at 40 amp setting. After this charge the battery checked 13.3 volts. I will recheck in the morning after it sits overnight. My question is: What volts should a new fresh battery show? Before and afer charging.
Thanks
Dave
  • If I remember correctly 2.1 volts per cell or 12.6 volts is considered a fully charged battery. Your reading of 13+ volts is surface charge and will drop once a light load is placed on the battery
  • I may be incorrect, but isn't setting the charger at 40 amp, a bit excessive, especially if the battery has almost a full charge? This weekend, I also charged my house batteries, but only had it set at 12 amps, and only did it for one hour out of precaution.
  • If the charger is an automatic charger, 40 amp is no problem. Once it gets near full charge the charger will cut back to a lower charge rate.
  • Dakota98 wrote:
    12.6 + = fully charged



    Those voltages are for a battery at rest with no load. At rest means it sat for 24 hours with no load or changing. Discounted from the vehicle is best!!

    Chris
  • When I periodically check my batteries while sitting idle over the winter, I am happy when they show 12.74v (two 6-volts at 6.37v & 7-years old).