12 Volt Deep Cycle Battery

[1L243]

My 2016 Travel Trailer came with one "Crown" Deep Cycle 12 Volt Battery. The only markings on the battery besides the Crown label is "G15" What Amps? What Amp Hour?

I can't locate a Crown battery dealer/distributor, who sells these batteries? What Group are they?

[valhalla360]

Assuming the existing battery is nearly new, just get one of the same type (wet cell, gell cell, etc..) and it should be fine.

[1L243]

I think going back to the Dealer to check with them if they installed the battery that would make it easy....Too easy!

[wa8yxm]

1L243 wrote:
Adding to, will be running parallel to the original battery. I thought it would be a good ideal to try and match the specifications of the first battery... But I will just find something similar in size....

Ah, Ok, there are many myths and half myths about multiple battery systems.

For example "All the batteries MUST BE IDENTICAL" ... Now...

If you are putting batteries in series, as one would do with a GC-2 (six volt 220 amp hour golf car battery) then the two batteries MUST BE IDENTICAL, ideally sequential serial number identical.. (But you need not be that obsessive) However if you have two pair, the second pair can be different from the first, so long as both batteries in THAT pair are identical.

There are many valid reasons for this.... But many apply series thinking to parallel batteries and this is where those reasons become Myth.

The Myth: If you hook two different batteries in parallel the smaller one will charge up first and signal the converter "Full Charge" and the larger one will never fill (True for batteries in series)

The Fact: The two batteries will form a perfect commune, the larger one will take the lion's share and the smaller one the rest of the charging current in direct purportion to their capacity, Thus both will reach full charge at EXACTLY the same time.

The related myth: When discharging the larger battery will supply more of the load and run down faster (half true)

The larger battery WILL provide more of the power, again in direct purportion to size, and both will run down at EXACTLY THE SAME SPEED in terms of state of charge.

WHY is this?

State of charge determines voltage, The lower the battery's voltage the more of the charge current it will suck up. when charging so they (After the first cycle) will be in perfect lock step.

Likewise the higher state of charge battery, thus higher voltage, will provide all teh current till it runs down to the other battery, so again after the first charge/discharge they are in perfect lock step.


The danger: If you have a really BIG battery (Say a 4D) and a very small (Say Group 24) in parallel and the smaller one shorts a cell.. It may go BOOM (well POP) spraying acid all over the place cause the larger battery will try to charge it, faster than it should be charged. But that kind of pairing is kind of rare.

[MEXICOWANDERER]

Crown and Trojan used-to-be the Bobsy-Twins as far as construction along with Pico and Arc Battery if that is any help.

[SoundGuy]

1L243 wrote:
My 2016 Travel Trailer came with one "Crown" Deep Cycle 12 Volt Battery. The only markings on the battery besides the Crown label is "G15" What Amps? What Amp Hour?

I can't locate a Crown battery dealer/distributor, who sells these batteries? What Group are they?

It's rare for any trailer to "come" with any battery as it's usually dealer installed. That being the case the obvious solution to getting more info about the battery is to ask the dealer who sold you the trailer.

[BoonHauler]

1L243 wrote:
Adding to, will be running parallel to the original battery. I thought it would be a good ideal to try and match the specifications of the first battery... But I will just find something similar in size....

You need the same battery so they charge correctly. Having one old and one new already has one strike against them charging correctly. Having a new different make of battery is two strikes against them.

[Travelon]

1L243 wrote:
My 2016 Travel Trailer came with one "Crown" Deep Cycle 12 Volt Battery. The only markings on the battery besides the Crown label is "G15" What Amps? What Amp Hour?

I can't locate a Crown battery dealer/distributor, who sells these batteries? What Group are they?

Batteries are usually installed by the dealer, did you ask them?

Travelon

[1L243]

Adding to, will be running parallel to the original battery. I thought it would be a good ideal to try and match the specifications of the first battery... But I will just find something similar in size....

[valhalla360]

Is this just random curiosity or are you trying to find a replacement?

If replacing, there is no need to match the brand and options depend more on how you use the battery. The manufacturer likely just put in the minimum they thought they could get away with.

[MEXICOWANDERER]

Dah Dee Dah Dee Dah...

Count

The

Cell

Caps

The dimensions I gave above will identify the BCI group size therefore the 20 ampere hour rate.

10-3/4" long BCI Group 24

12 long BCI Group 27

¿Hokay?

[NinerBikes]

wa8yxm wrote:
I agree with Niner, a GC-15 is a six volt battery

NOTE: Thanks to the Golf Car industry 12 volt DEEP cycles are getting easier to find, Check out battery size GC-12 If the size and weight are the same, that's what you have.. Alas, that's all I can tell you.

It's G-15, not GC15, a date code. I've no idea the voltage of the battery.

[wa8yxm]

I agree with Niner, a GC-15 is a six volt battery

NOTE: Thanks to the Golf Car industry 12 volt DEEP cycles are getting easier to find, Check out battery size GC-12 If the size and weight are the same, that's what you have.. Alas, that's all I can tell you.

[NinerBikes]

G-15 is a date code, the date the battery was built or made. July, of 2015. Warranty starts the day you bought the trailer.

[MEXICOWANDERER]

10-3/4" long figure 85 amp hours

12" long figure 105 amp hours