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Old 14-05-2016, 03:35   #1
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New lead acid batteries

Do batteries come charged when you first buy them? Is there a certain "first charge" procedure you have to follow? I purchased sportsman deep cycle batteries and having trouble with them keeping charge.

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Old 14-05-2016, 05:05   #2
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Re: New lead acid batteries

Most wet batteries are fully charged and tested before shipping, however batteries will self-discharge when not in use during transportation and storage. The rate of self discharge is a function of grid alloy and storage temperature. Basically, for all lead-acid batteries, the rate of self discharge increases with storage temperature. The total charge lost is a function of the time in storage at a given temperature.

The first charge brings the battery to an operational state. Before this charging process, the cell electrolyte level should be checked, making sure the electrolyte covers the plates. If this isn’t the case, add distilled water until all the plates are submerged. It is important not to over fill because the level will rise slightlyduring the charge process.

Consult your specific manufacturer’s Installation Operation and Maintenance Manual (IOM) for details.

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Old 14-05-2016, 13:09   #3
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Re: New lead acid batteries

When you buy them ask the dealer to show you the manufacturers date on the battery and if they are say more than a month older than the purchase date either look for those that are closer or find a dealer with a higher turnover whose batteries do not lie in stock for long periods.
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Old 14-05-2016, 13:18   #4
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Re: New lead acid batteries

Google "Breaking in New Batteries", too. It takes a few cycles and partial discharges to get plates etched.
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Old 15-05-2016, 08:27   #5
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Re: New lead acid batteries

On shore power my automatic charger charged my new AGM batteries for over 24 hours to get to 14.7 v. Then it just does enough to stay close to 13.4. So yes, there is a good chance your batteries will not be fully charged when you pick them up.
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Old 15-05-2016, 13:05   #6
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Re: New lead acid batteries

You can also sometimes buy a dud battery. I bought one, what a pain. I figured the battery was new, so started taking everything else apart trying to get the engine to turn over. The volts looked good, which fooled me, but it couldn't supply any current. I returned it to the store with great aplomb. A new (non-dud) and everything worked perfect. My luck.
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Old 15-05-2016, 13:23   #7
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Re: New lead acid batteries

What are your actual voltages readings at rest? I have found brand new batteries to be about 12.45 volts after a good long charge and resting overnight. It would be helpful to have more details. But if they are actually discharging badly on their own, check each for being hot after charging. A hot battery indicates an internal short. I have had two fairly new batteries shorted over the years.
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Old 15-05-2016, 15:54   #8
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Re: New lead acid batteries

From Crown battery
A freshening charge is used to bring a new battery to a fully charged condition before it is placed into service, or when a battery has been standing idle for a short time period. A freshening charge is typically a soft charge at a low output (3 to 6 amperes per 100 ampere hours of the battery’s rated capacity) for approximately 3 hours. This allows the battery to be restored to a fully charged condition maximizing the battery’s electrical storage capability. All new batteries should receive a freshening charge before placing the battery into service.
More Infomation And FAQ's | Crown Battery

I'll guess other manufacturers would say something similar.

I had a new lifeline gpl-31XT fresh from the concorde factory that was reading 13.06v on delivery. I held it at 14.4v for hours but amps were not tapering to 0.625, seemed to stall out at 0.82a. When I discharged it to ~ 50% then high amp recharged it at 40+ amps initially until 14.4v and then held 14.4v, amps did taper to 0.63, and it held 13.23v for a week afterwards.

Impressive battery. Took 5Ah from it, voltage rebounded to 13.16v and held there for days
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Old 15-05-2016, 19:18   #9
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Re: New lead acid batteries

should be fully charged at time of sale. Check with hydrometer and should get 1275 or so.
if you ran the engine, then let them sit overnight, should still read close to that. If not, take them back.

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