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Old 07-05-2015, 05:03 PM   #1
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2005 30' Classic
Brentwood , Tennessee
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Battery Questions

I have 2 Interstate HD-24 DP Deep Cycle batteries in my 2005 31' classic trailer. I don't remember when I installed them but it was at least 5 years ago. I have shore power to the trailer during storage and have no problems with them (that I know of) but have heard that batteries need to be replaced from time to time. Should I be looking for new batteries or have the old ones tested? Is there a simple test that I can perform to check the batteries? Is Interstate a good choice if replacement batteries are needed? Thanks in advance for any help.
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Old 07-05-2015, 05:37 PM   #2
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2002 30' Classic S/O
Fleming Island , Florida
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If they are holding a charge, evidenced by lasting an appropriate amount of time when you don't have shore power then, no, you don't need to replace them.

Al
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Old 07-05-2015, 10:02 PM   #3
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For Interstate lead-acid batteries, look on the top of the battery and in one of the corners you will see a 2-character code. (It is not on the label nor on the rim around to cover. It's stamped in.)
The first character is a letter:
A=January
B=February
... and so on

The next character is a number, for the last digit of the year
1=2011
2=2012
3=2013
and so on

E5 = May 2015

Don't buy a battery more than 3 months' old. It's beginning to deteriorate. The store is supposed to send those back to the manufacturer

Quality batteries that are taken care will last several years. The one in my 2004 SUV is original, still started in -5 F degree weather last winter. (Dealer says I need a new one, though.) My deep cycle batteries in the boat are several years old, heavily used in the summer and fall. I just checked them last week and they are still going strong.

If your battery is not sealed you can check the cells with a hydrometer from your local parts store, or order a quality one online. If it's sealed (or not) you can take it to the parts store and they can run a test under load to better determine it's state.
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