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Old 12-19-2014, 11:59 AM   #1
vink OP
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6V battery charging

Has anyone used a Battery Tender to trickle charge two 6V batteries in series.
i.e 12v across two 6V batteries??

I have an XL350 thumper and it would be convenient to use the one, 12V Battery Tender for both the 6V 350 and the 12V ST1100.

Or am I just plain insane??...

Thanks
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Old 12-19-2014, 12:13 PM   #2
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I think If you charge two batteries at the same time the charger will be charge the battery with the least charge till its fully charged, (because the charger senses the the total charge level of the two batteries at a combined 12 volts.) The battery with the higher starting charge will be overcharging until the other battery catches up. Thats kind of wordy, I hope it makes sense. emti
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Old 12-19-2014, 12:50 PM   #3
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it will work though one battery might get a better charge than the other. it will charge both batteries at the same time, but if the individual internal resistance & state of charge of the batteries are different (they will be) then one will reach full charge before the other. continued charging will over charge that one. how much difference will it make? dunno. practically speaking if the batteries are in decent shape you will never know the difference. if one is really weak, it will never come up and the other will probably boil off a bunch of water. I assume these are wet cell design.... watch the electrolyte level while they charge
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Old 12-19-2014, 01:00 PM   #4
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Bad idea unless the two batteries are the same make, model, and age...otherwise as was said they will not charge properly and/or possibly be damaged. It is common to charge identical 12V batteries in series with a 24 volt charger (or in telecom 24 identical 2V series wired batteries with 48 volts)
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Old 12-19-2014, 01:11 PM   #5
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Originally Posted by victor441 View Post
Bad idea unless the two batteries are the same make, model, and age...otherwise as was said they will not charge properly and/or possibly be damaged. It is common to charge identical 12V batteries in series with a 24 volt charger (or in telecom 24 identical 2V series wired batteries with 48 volts)
Car batteries are made up of 2V cells wired in series, so the same thing is going on as in your telecom example. I see the point of making sure that two physical batteries wired in series be the same, to decrease the chance of unbalanced charging.

If one wanted to get fancy, a pair of 6V batteries could be wired in series for load and in parallel for charging. (Need to use diodes.) Have to have a 6v charger for that setup.
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Old 12-19-2014, 01:29 PM   #6
groundrules
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Quote:
Originally Posted by vink View Post
Has anyone used a Battery Tender to trickle charge two 6V batteries in series.
i.e 12v across two 6V batteries??

I have an XL350 thumper and it would be convenient to use the one, 12V Battery Tender for both the 6V 350 and the 12V ST1100.

Or am I just plain insane??...

Thanks
Vink
Schumacher makes a dual voltage charger that I use to solve this problem. not expensive.
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Old 12-19-2014, 02:29 PM   #7
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Schumacher makes a dual voltage charger that I use to solve this problem. not expensive.
+2. ^^^^^^^^^

It has automatic voltage sensing and it's a quality "smart charger" that wil not over charge or force water out of the battery. I say that because some smart chargers are really not that smart.

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showkey screwed with this post 12-19-2014 at 04:54 PM
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Old 12-19-2014, 07:22 PM   #8
vink OP
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Thanks

Great feedback, Great battery explanations it all made sense.
I figured I was being insane again,

I'll get another charger for it.

Thanks all and happy holidays
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Old 12-20-2014, 12:47 AM   #9
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I stick by my other post. personally, I would try what you have and see what happens. just keep a meter handy and watch. also, if they start to bubble aggressively or get hot, then thats too much. hell.... you can put a 12v charger on a 6v battery for short bursts and that will work too
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Old 12-20-2014, 07:08 AM   #10
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^^^^^^^^^^^^^. What ever works....
Heat and over charging are the worst think you can for a battery next to allowing it to go dead and freezing it solid.

^^^^^^^^^^
That's also why they make smart chargers smarter than the user.......
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Old 12-20-2014, 08:27 AM   #11
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Quote:
Originally Posted by showkey View Post
+2. ^^^^^^^^^

It has automatic voltage sensing and it's a quality "smart charger" that wil not over charge or force water out of the battery. I say that because some smart chargers are really not that smart.

Good little charger. My friend has one but we had to trick it when we tried to charge a pretty dead 6V battery.Trying to remember??? I think the dead one was showing 2.8V(?) and the charger wasn't kicking in. So we tricked it with another good 6V in parallel until the surface charge on the dead one was high enough to kick in the charger.

Neither one of us tought it would be a good idea to leave them both connected to the charger so we removed the good/new 6V. Experimentations!....maybe but my friend already had a battery explode in his shop, experiments are fine when you can keep an eye on them. At our ages....we get sidetracked and forget.
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Old 12-20-2014, 04:48 PM   #12
showkey
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Good little charger. My friend has one but we had to trick it when we tried to charge a pretty dead 6V battery.Trying to remember??? I think the dead one was showing 2.8V(?) and the charger wasn't kicking in. So we tricked it with another good 6V in parallel until the surface charge on the dead one was high enough to kick in the charger.

Neither one of us tought it would be a good idea to leave them both connected to the charger so we removed the good/new 6V. Experimentations!....maybe but my friend already had a battery explode in his shop, experiments are fine when you can keep an eye on them. At our ages....we get sidetracked and forget.
+2 ^^^^^^^^^
No charge on a "dead" battery is a common smart charger problem.........it needs to do a polarity check before actual charging. Tricking it ......is the trick.
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Old 12-21-2014, 12:33 PM   #13
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+2 ^^^^^^^^^
No charge on a "dead" battery is a common smart charger problem.........it needs to do a polarity check before actual charging. Tricking it ......is the trick.
Watch them tricks.....I visited my friend yesterday and he showed me a battery he forgot on the charger. Sealed battery similar to the mobility scooters, was only supposed to be on the dumb charger for a kick and he forgot it overnight.A little misshapened now and looks cooked.

Yep I gave him shit and told him once again to move all his batteries/chargers right next to the exit door or outside instead of buried with the other junk on the bench where he can't see it and forgets.
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Old 12-21-2014, 12:55 PM   #14
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Watch them tricks.....I visited my friend yesterday and he showed me a battery he forgot on the charger. Sealed battery similar to the mobility scooters, was only supposed to be on the dumb charger for a kick and he forgot it overnight.A little misshapened now and looks cooked.

Yep I gave him shit and told him once again to move all his batteries/chargers right next to the exit door or outside instead of buried with the other junk on the bench where he can't see it and forgets.

The dumb charger was the problem........not a trick or process to confirm polarity.
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Old 12-21-2014, 02:56 PM   #15
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+2 ^^^^^^^^^
No charge on a "dead" battery is a common smart charger problem.........it needs to do a polarity check before actual charging. Tricking it ......is the trick.
I've had to do that too with a Battery Tender Jr., it won't start charging if the battery voltage is really low, paralleling the dead battery with a good one for a few minutes "tricked" it.
FWIW lead acid batteries can sometimes reverse polarity on their own if deeply discharged.
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