Charging 6V battery

Submitted: Wednesday, Jan 27, 2010 at 10:18
ThreadID: 75531 Views:11081 Replies:6 FollowUps:13
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We have a Coleman hot water on demand which works great the only concern I have is when it's time to charge the 6V battery it can only be done via the AC/DC adaptor through the unit. This takes some time (obviously) & can be a pain. The battery has two horizontal pins that the pos & neg leads slip onto. Can someone suggest a quicker alternative to charging the battery?
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Reply By:- Wednesday, Jan 27, 2010 at 10:36

Wednesday, Jan 27, 2010 at 10:36
Not knowing the unit, I can't make recommendations except to try and get hold of a second battery which you could use while the other one is on charge.
This only makes sense if they're easily interchangeable and the setup allows for external battery charging of course. Purchasing an inexpensive 6V charger for the second battery could also be considered - but make sure it matches the battery type/chemistry.

Best regards, batterymeister
AnswerID: 401276

Follow Up By: OREJAP - Wednesday, Jan 27, 2010 at 10:46

Wednesday, Jan 27, 2010 at 10:46
Yep, have got a second battery but the only way of charging the flat one is leave it in the Coleman & plug it in or use the second fully charged, get your hot water then get it out of the Coleman, plug in the flat one, put it back into the Coleman & put it on charge. The 6V is a FP645 (6v 4.5 Ah/20hr) Rechargeable made byFirst Power designed for standby & cyclic use.
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FollowupID: 670568

Follow Up By:- Wednesday, Jan 27, 2010 at 11:12

Wednesday, Jan 27, 2010 at 11:12
that's what I thought....

Your battery is probably a AGM VRLA type, for which you could purchase another charger.
Shop around for a 6V/1A unit.

Best regards, batterymeister
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FollowupID: 670574

Follow Up By: Mandrake's Solar Power- Wednesday, Jan 27, 2010 at 12:54

Wednesday, Jan 27, 2010 at 12:54
If you have a CTEK charger or similar - I'm fairly sure they have a motorcycle battery mode which would be 6v ??

Cheers

Steve

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FollowupID: 670593

Follow Up By: Mandrake's Solar Power- Wednesday, Jan 27, 2010 at 13:07

Wednesday, Jan 27, 2010 at 13:07
Forget that idea - just checked CTEK specs and its all 12 volt !!
Sorry - back to plan A - 6v Charger ..

Cheers

Steve
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FollowupID: 670594

Follow Up By: Member - Christopher P (NSW) - Wednesday, Jan 27, 2010 at 13:58

Wednesday, Jan 27, 2010 at 13:58
My sister had one, it ran flat on us while we were on moreton island, her brother, me, had a jumpstart pack that we hooked up whilst we roved all over the island same with the coleman lamp, plugged it into a jump start pack i had and left it!

Then all you do to charge the jump start pack is hook it up to your vehicle and run for 20 mins or so.

I boughtr a deals direct one and threw to battery that was in it out, dead, sorry recycled the battery, put a 12v/ 20 amp battery in it and goes well!


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Follow Up By: Member - Andrew (QLD) - Wednesday, Jan 27, 2010 at 14:16

Wednesday, Jan 27, 2010 at 14:16
The XC-800 is 6v Steve.

Andrew
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Reply By: Member - Andrew (QLD) - Wednesday, Jan 27, 2010 at 14:21

Wednesday, Jan 27, 2010 at 14:21
I'd been thinking about this issue with mine for some time.

What about using a voltage regulator similiar to this one from jaycar with suitable heatsink and then running the unit from 12v (either small 12v vrsla or external lead to vehicle etc): http://jaycar.com.au/productView.asp?ID=ZV1506



Would this work?

Andrew
AnswerID: 401307

Follow Up By:- Wednesday, Jan 27, 2010 at 14:28

Wednesday, Jan 27, 2010 at 14:28
works a treat if you know what you're doing :)

Best regards, batterymeister
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Follow Up By: Member - Andrew (QLD) - Wednesday, Jan 27, 2010 at 14:30

Wednesday, Jan 27, 2010 at 14:30
umm, err, ok then :)

Andrew
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Reply By: Member - Andrew (QLD) - Wednesday, Jan 27, 2010 at 14:43

Wednesday, Jan 27, 2010 at 14:43
I can't recall (don't have mine here ATM)......can you just run the unit with the 12v charger lead whilst it is charging? Does the charger disable the unit?

Andrew
AnswerID: 401308

Follow Up By: Honky - Wednesday, Jan 27, 2010 at 16:07

Wednesday, Jan 27, 2010 at 16:07
Only going from memory here but the charger that comes with the coleman water heater is actually 12 volt.
Is there a step down circuit within the internal system?

Honky
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FollowupID: 670630

Follow Up By: Member - Andrew (QLD) - Wednesday, Jan 27, 2010 at 18:02

Wednesday, Jan 27, 2010 at 18:02
There would have to be some internals to it one would think. My coleman is 1000km away at the moment so i can't check.

Andrew
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Reply By: Member - Neil G (VIC) - Wednesday, Jan 27, 2010 at 19:34

Wednesday, Jan 27, 2010 at 19:34
I had the same problemwith our Coleman so I got a 12 volt to 6 volt converter from Dick Smith or Jaycar (Iforget which) and changed the outlet to spade type plugs and plugged these into the plugs that would normally plug into the 6v battery. I now plug thColeman into any 12 volt outlet on the Camper or Toyota and it works really well - no more "low battery" lights!!
I can simply revert to the 6v battery if I ever need to.
AnswerID: 401358

Reply By: Member - Flynnie (NSW) - Wednesday, Jan 27, 2010 at 20:11

Wednesday, Jan 27, 2010 at 20:11
Orejap

I have one of those Coleman Hot Water on Demands and am rather surprised that you find this a problem at all.

It recharges quickly when plugged in to a car 12 volt source. To say this can only be done via the AC/DC adaptor is a comment I don't understand. Like what else could there be? It allows plugging in to 240 volt (via adaptor) and 12 volt sources and charges quickly.

I have also a Gasmate unit (long boring story) and the Coleman IMHO is much easier to recharge in a vehicle. From 240 volt they are much of a muchness.

Frequent recharging is the key, like after each use, not waiting until it is flat.

One peculiarity of the Coleman is that the 240 volt power pack puts out an AC current not DC. Yet the same socket will take 12 volt DC. DO NOT USE the 240 volt adaptor on something that wants 12 volt DC. You may well cook it. Found this out the hard way. :(

Flynnie
AnswerID: 401370

Follow Up By: OREJAP - Wednesday, Jan 27, 2010 at 22:02

Wednesday, Jan 27, 2010 at 22:02
Thanks very much for all the replies. Flynnie, what I was trying to say about the AC/DC charging was that it has to be done through the unit. I was trying to raise the point that whilst the spare is in and running the unit there was no other way to charge the battery that was flat apart from putting it back inside the unit. You say charge it after every use. Well I thought that also. I followed instructions when we first got the Coleman & charged it (as per instructions) for at least 12 hours. The damn thing handled about 4 applications & would not run the unit. Low battery light on. So, thought I would throw it in the river & decided against that so when I got home I rang Coleman. The lady who answers all their calls said "Take it back to where you bought it & get another." Did not want to enquire about the problem so I asked to speak with Technician. A very knowlegable guy who works on the Colemans knew the ins and outs about them. He said, "Charge battery for 12 hours is B S" Charge the battery for 24 hours. Charging for short periods is no good for battery. Prior to going away I charge both batteries for 24 hours each. No problems. My concern is, that when batteries are being used & one is flat I would like another way to charge battery than through the Coleman unit. It would be great to put coleman plug into 12 volt outlet or have Aligator clips to clip onto car battery but they are not made for that...Shame. Coleman stipulate that the battery is good for approximately 9 applications (I hope I am correct from memory) before the unit will fail. So Coleman do not mention anything about charging after every application/use.
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Follow Up By: Member - Andrew (QLD) - Thursday, Jan 28, 2010 at 01:00

Thursday, Jan 28, 2010 at 01:00
Page 9 of the manual mentions "charge battery immediately after each outing to reach optimum performance."

The specs mention that a full charge is good for 150 litres of water...which is quite a bit of water when using these appliances for their intended task. There should be no problem running just the one battery and charging it nightly or every couple of days for 10-12 hours max.

Andrew.
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FollowupID: 670739

Follow Up By: Member - Flynnie (NSW) - Thursday, Jan 28, 2010 at 20:52

Thursday, Jan 28, 2010 at 20:52
Orejap

Sorry I did not pick up that you had already clarified you were juggling 2 batteries.

The CTEK 6 volt charger has been suggested and you could need an inverter as well.

Too much gear! It is bulky enough as it is in its bag with a few spare disposable lpg bottles

I can not see the usefulness of a second battery. When I got my first Hot Water on Demand I remember checking it out wondering how one could keep a second battery charged. In any event the access to the battery is not set up for a quick swap. To me the only use for a second battery is as a replacement should the first go dead.

Mine has run for a few 20 litre showers without recharging. Recharging is not a problem for me as I have some 12 volts sockets on the cruiser.

I found no way to run it directly from 12 volts or 240 without modification, which I would not do. When you plug in external power it cuts the unit off and only recharges it. This is a design decision in keeping with its intended use as a camping accessory. After all it is not intended for a semi permanent or permanent setup, Carbon monoxide and other hassles in enclosed spaces no doubt.

On my profile are a few comments on the Coleman and Gasmate hot water system.

Flynnie
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FollowupID: 670869

Reply By: travelmate2 - Thursday, Jan 28, 2010 at 00:17

Thursday, Jan 28, 2010 at 00:17
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AnswerID: 401409

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