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Open Roads Forum  >  Tech Issues

 > 6 Volt Batteries at Costco

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SweetLou

La Quinta, CA USA

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Posted: 11/13/08 12:04am Link  |  Print  |  Notify Moderator

What do these numbers stand for on a 6 volt battery at costco?

220 Amp hrs @ 20 hr (is this for 2 batteries?, or what about for 2 6v bats)

Battery rated @ 100 min

Min @ 75 amp : 100

Min @ 25 amp : 425

these are costco golf cart batteries that apparently Johnson Control makes. I don't know how good they are but I think they are better than my 12v interstates that came with the coach. The trailer was made Jan of 2007 and the batteries couldn't hold a long charge last summer. I confirmed that last weekend when the power went out at our campground for 7 hours. We weren't at the trailer and everything 12v was off and the batteries were charging at 13.5 for 21/2 days. When we got back and turned on 2 sets of lights they only read at 12.25.amps. I have taken good care of these batts with proper filling of DI water, and regular maintenance. They just didn't hold up. I want to switch to 2 6volts. Any advice would help. Also does Johnson Control really make them for costco and are they any good?


2005 3500 Cummins HO Quadcab 4x2 3.73 6 spd man, 2007 HitchHiker Discover America 329 RSB
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Deen

Vancouver, WA

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Posted: 11/13/08 12:57am Link  |  Print  |  Notify Moderator

SweetLou wrote:

What do these numbers stand for on a 6 volt battery at costco?

220 Amp hrs @ 20 hr (is this for 2 batteries?, or what about for 2 6v bats)

Battery rated @ 100 min

Min @ 75 amp : 100

Min @ 25 amp : 425

these are costco golf cart batteries that apparently Johnson Control makes. I don't know how good they are but I think they are better than my 12v interstates that came with the coach. The trailer was made Jan of 2007 and the batteries couldn't hold a long charge last summer. I confirmed that last weekend when the power went out at our campground for 7 hours. We weren't at the trailer and everything 12v was off and the batteries were charging at 13.5 for 21/2 days. When we got back and turned on 2 sets of lights they only read at 12.25.amps. I have taken good care of these batts with proper filling of DI water, and regular maintenance. They just didn't hold up. I want to switch to 2 6volts. Any advice would help. Also does Johnson Control really make them for costco and are they any good?
Wired for 12 V output from 2 6 volt doubles the voltage and keeps the same amp hours. We have 4 Interstate U-2200's so that doubles the voltage and amps available.

Golden_HVAC

Fulltime, CA, USA

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Posted: 11/13/08 04:07am Link  |  Print  |  Notify Moderator

SweetLou wrote:

What do these numbers stand for on a 6 volt battery at costco?

220 Amp hrs @ 20 hr (is this for 2 batteries?, or what about for 2 6v bats) Yes this is 220 amp hours at 12 volts when you have two batteries in series.

Battery rated @ 100 min

Min @ 75 amp : 100 This means that you can draw 75 amps for about 100 minutes before the battery voltage goes below 10.2 volts. It is useful in measuring how far a golf cart will drive.

Min @ 25 amp : 425 When compairing to another 12 or 6 volt battery, this is a useful measure of the practiical power of the batteries. So at a 25 amp load, it should last about 425 minutes before reaching 10.2 volts. Why 25 amps? That is what a typical boat trolling motor might draw, and thus was the standard for measuring deep cycle batteries used for that purpose.

these are costco golf cart batteries that apparently Johnson Control makes. I don't know how good they are but I think they are better than my 12v interstates that came with the coach. The trailer was made Jan of 2007 and the batteries couldn't hold a long charge last summer.

I confirmed that last weekend when the power went out at our campground for 7 hours. We weren't at the trailer and everything 12v was off and the batteries were charging at 13.5 for 21/2 days. When we got back and turned on 2 sets of lights they only read at 12.25.amps. Probably read 12.25 Volts

I have taken good care of these batts with proper filling of DI water, and regular maintenance. They just didn't hold up. I want to switch to 2 6volts. Any advice would help. Also does Johnson Control really make them for costco and are they any good?


I agree that two years is the expected life of a 12 volt battery, while my Trojan T-105 batteries lasted for 9 years, being a little longer than a normal life for 6 volt batteries.

The deeper area below the cells allows more minerials to build-up below the plates before they short out, and the thicker paltes allow a longer battery life before they are fully depleted. Also their heavy weight allows them to charge and discharge at a fast rate without overheating to much.

While the ideal charge rate is 20 amps for 10 hours, you could charge at 40 - 50 amps for a shorter charge time.

Fred.

smkettner

Southern California

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Posted: 11/13/08 08:49am Link  |  Print  |  Notify Moderator

Those batteries will do fine. In series you add volts NOT amp hours. So with the pair you have 12 volts and 220 amp hours. The minutes is the minutes of amp load to 10.5 volts or 100% discharge.


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wa8yxm

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Posted: 11/13/08 07:56am Link  |  Print  |  Notify Moderator

SweetLou wrote:

What do these numbers stand for on a 6 volt battery at costco?

220 Amp hrs @ 20 hr (is this for 2 batteries?, or what about for 2 6v bats)



That is really the only important one.. It is the indication of the capacity of the battery,, That is in line with Interstates which also may be made by Johnson Controls.. Or by one other company.

(Xantrex says 'Interstate by Johnson controls' in the owner's manual for my inverter)

I would not say they are better than your interstates.. or, for that matter, different.

Most issues with battery life are the fault of either the converter or the owner.. Running them all the way down, not adding distilled water when needed or the converter over/under charging kill more batteries than you can imagine.


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RJsfishin

Winston Or.

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Posted: 11/13/08 05:22am Link  |  Print  |  Notify Moderator

Using the original batteries as a guide as to how long a battery will last, is not a good or fair comparison at all.
You may have taken good care of those batteries while they were in your control, but they were most likely well used and abused before you ever bought the coach.

2 years is much less than the average life of a well maintained 12v battery.

My RV was 6 yrs old when I bought it, and the US 6v batteries in it were completely shot, and recipets showed they were 3 yrs old, so there was 2 set of 6v batteries that lasted only 3 yrs each, probably because both sets were abused at the RV factory and RV dealers.

The well maintained replacement interstate (JC) batteries are now 4 yrs old, and perform like new yet.

With todays hi tech chargers and better education, all, including 12v batteries are lasting much longer.


Rich

'01 31' Rexall Vision, Generac 5.5k, 1000 watt Honda, PD 9245 conv, 300 watts Solar, 400 watt inv, 2 12v batts, ammeters, led voltmeters all over the place, KingDome/sat, 2 Oly Cat heaters, and towing a Dodge GCV, or a Lowe bass boat, or a Kawi Mule.


bryanl

Reno, NV

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Posted: 11/13/08 10:22pm Link  |  Print  |  Notify Moderator

re: 220 Amp hrs @ 20 hr - Min @ 75 amp : 100 - Min @ 25 amp : 425

These are all energy capacity ratings. As noted, the 20 hour rating is the one most often used for comparisons. That is about an 11 amp or 65 watt power draw. When you pull larger currents, like 25 or 75 amps, the available capacity is reduced due to what is known as the Peukert coefficient. The additional capacity specifications can be used to determine what this coefficient is.

75A for 100 minutes is about 125 AH and 25A for 425 minutes is 177 AH. Generally, increasing current by a factor of two will result in a 15% or so reduction in capacity and these specifications show this.

See Basic battery guidelines to help choose and use batteries for your RV.


Bryan

Harry Havasu

Lake Havasu City, Az.

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Posted: 11/15/08 12:11am Link  |  Print  |  Notify Moderator

BrokenElbow wrote:

I switched from 2x12v Interstate #24 batteries to 2 of the Costco 6v golf cart units. I love 'em.


Me Too !!!

Over my 60 years of RVing - on and off, I've used up and thrown away more 12 volt batteries than I care to remember.

AGMs, watered and everything else just didn't have the life span.

Some of that was my fault but the Costcos just look like they are forgiving and will be around for awhile. I hope so.


Harry Havasu

smkettner

Southern California

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Posted: 11/15/08 09:50am Link  |  Print  |  Notify Moderator

The golf batteries do have at least 30% more power than two group 24s.

BrokenElbow

Valencia, CA

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Posted: 11/13/08 10:56pm Link  |  Print  |  Notify Moderator

I switched from 2x12v Interstate #24 batteries to 2 of the Costco 6v golf cart units. I love 'em.


2011 Montana 3455, MorRyde pin box, TrailerSaver BD3 air hitch, G614 tires, 2x6volt batts, 2 x Honda 2000i, Rotochoks, 6 pnt Levelup, TST TPMS, Arvika bike rack, Voyager Semi Wireless Rear Cam, Flojet Mascerator, 2008 F350 Lariat 6.4L diesel 4x4 SB CC SRW


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