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Old 07-05-2015, 05:03 PM   #1
1 Rivet Member
2005 30' Classic
Brentwood , Tennessee
Join Date: Jun 2009
Posts: 18
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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Al and Missy's Avatar

2002 30' Classic S/O
Melbourne Beach , Florida
Join Date: Nov 2013
Posts: 1,482
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.



"You cannot reason someone out of a position they have not been reasoned into"

Al, K5TAN and Missy, N4RGO
2002 Classic 30 Slideout
2001 Safari 25 RB Twin (Gone, but not forgotten)
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
WBCCI 1322, TAC FL-39, AIR 82265

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Old 07-05-2015, 10:02 PM   #3
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2006 23' Safari SE
Lexington , Kentucky
Join Date: Dec 2012
Posts: 1,613
Images: 6
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:
... and so on

The next character is a number, for the last digit of the year
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.

Rich & Yvonne
2006 Safari SE -Dora-
2004 4Runner SE

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