Will a Battery Tender Charge both Batteries?

[Burn'n Oil]

No, it wasn't the charger. As I said, my son had the same experience. We both sent the chargers back to the manufacturer for testing. They said the chargers were fine, get a higher amp charger. Batteries were not defective

Things that make ya go hmmm...

 

[John Jensen]

Things that make ya go hmmm...

Yep! hmmm for sure. They were Ctek chargers. I no longer use Ctek products

 

[IronByron]

I just realized I can charge both batteries from the rear bumper with my 7 way to 12vdc adaptor. Then I just plug in the tender with the 12vdc port adaptor. Now I don’t have to worry about wiring up a connector off the batteries.

Ha as a bonus, the day I forget to unhook before driving off, it will just unplug as I roll away! (I know I will forget sometime)

 

[Great White North Eh]

Now that’s smart! Handy’r than pockets in your underwear

 

[carlrx7]

The voltage drop on t

Best i can find right now is here: https://www.menards.com/main/tools/...eg-battery-charger/bc25bs/p-1458270034898.htm 69.99

Looks like its random. follow the price here: https://camelcamelcamel.com/product/B01BYFSUJW

Back down to 49 buck-a-roos!

Collected some data points with a quick cycle using my bench battery today. In phase 1 (Bulk) it puts out a Constant Current of 25 amps until 14.2 volts is reached. Switches to Phase 2 (Absorb) and limits current to maintain Constant Voltage of 14.2. Once current drops below 1 amp it is fully charged and switches to Phase 3 (Float) and maintains 13.5 volts @ < 1 amp. Overall, very happy with the charger, 14.2 is the happy medium between safe/agressive charging, should work with all lead/acid/agm batteries. Enjoy!

 

[John Jensen]

The voltage drop on t


Back down to 49 buck-a-roos!

Collected some data points with a quick cycle using my bench battery today. In phase 1 (Bulk) it puts out a Constant Current of 25 amps until 14.2 volts is reached. Switches to Phase 2 (Absorb) and limits current to maintain Constant Voltage of 14.2. Once current drops below 1 amp it is fully charged and switches to Phase 3 (Float) and maintains 13.5 volts @ < 1 amp. Overall, very happy with the charger, 14.2 is the happy medium between safe/agressive charging, should work with all lead/acid/agm batteries. Enjoy!

Nice report. It looks like a winner and the price is definitely right.

Edit:
49 bucks didn't last long, now back up to 81.00+

 

[lovegolf44]

I'm on day 4 charging with my new Deltran 5amp charger, still not fully charged. Either my batteries are way drawn down or this new charger is defective. Hoping it's the former. I'll give it a few more days.

 

[carlrx7]

I'm on day 4 charging with my new Deltran 5amp charger, still not fully charged. Either my batteries are way drawn down or this new charger is defective. Hoping it's the former. I'll give it a few more days.

Measure the voltage with the charger hooked up, what is it at? If below 14v, is it still increasing after 30 minutes? Some smart chargers give up at a set time for "safety", reset the charger and see if it kicks back in.

 

[lovegolf44]

Measure the voltage with the charger hooked up, what is it at? If below 14v, is it still increasing after 30 minutes? Some smart chargers give up at a set time for "safety", reset the charger and see if it kicks back in.

Come to find out, I must not have had the alligator clips connected quite right according to the instructions on the tender. Now that they're connected up correctly I'll wait and see how long it takes to charge the batteries.

 

[Burn'n Oil]

Come to find out, I must not have had the alligator clips connected quite right according to the instructions on the tender. Now that they're connected up correctly I'll wait and see how long it takes to charge the batteries.

Shouldn't be measured in days, though. Most current smart chargers will time out after 24 hrs if the battery/s are not responding.

 

[lovegolf44]

Shouldn't be measured in days, though. Most current smart chargers will time out after 24 hrs if the battery/s are not responding.

I'm good now. Come to find out, I didn't have a good ground connection according to the indicator LED. Both batteries now charged and ready to go.