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So the battery tender can only charge one battery at a time?

-B

Normally, you leave it alone. The system is designed to be very simple. For normal use, you leave the system in the "DUAL ON" mode (green LED), and leave it alone - nothing to switch unless you have a starting / charging problem; the vehicle starts on the main battery, and then both batteries are charged while running. When you turn off the vehicle, the batteries are isolated from each other. If you have a dead battery, you can self-jump by switching to the "EMER ON" mode (red LED), which connects both batteries to start. If you have an alternator failure, you can switch to "DUAL OFF" mode (no LED), which prevents the aux battery from draining when the vehicle is on, giving you about twice the distance w/o the alt...:)
 

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Yes! I have one n I only charge the alternate battery.
A simple jumper while using the battery tender would allow both batteries to be serviced from the one tender.I might have missed something but the newer battery designs will stay charged for a year if there is no draw.What do you have hooked to the back up battery that is hot all the time.I know there is a small drain on the primary so that would be where I would have the tender if I was only going to charge one battery.
 

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A simple jumper while using the battery tender would allow both batteries to be serviced from the one tender.I might have missed something but the newer battery designs will stay charged for a year if there is no draw.What do you have hooked to the back up battery that is hot all the time.I know there is a small drain on the primary so that would be where I would have the tender if I was only going to charge one battery.
I have an arb freezer that is always on.
 

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A simple jumper while using the battery tender would allow both batteries to be serviced from the one tender.I might have missed something but the newer battery designs will stay charged for a year if there is no draw.What do you have hooked to the back up battery that is hot all the time.I know there is a small drain on the primary so that would be where I would have the tender if I was only going to charge one battery.
Acutally I don't have anything thats hooked up to the aux battery thats hot all of the time! So it sounds like I should just have the Battery Tender on the main battery?

-B
 

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Acutally I don't have anything thats hooked up to the aux battery thats hot all of the time! So it sounds like I should just have the Battery Tender on the main battery?

-B
That is what I am hinting at. It makes so much more sense when you think of it.:cheers:
 

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Discussion Starter · #27 ·
If you have a Dirty Parts dual battery kit, you can put the kit in the "Emer On" (red LED)mode while hooked up to the battery tender, and both batteries will be charged (although at a slower pace due to the larger load). Just remember that in this mode both batteries are connected, so both batteries can drain down together, too - so turn everything off, and remember to switch back to "Dual On" (green LED) mode when you disconnect the tender...
 
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