brotherjethro
Posts: 29
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

Re: Battery Tender Jr

Tue Oct 31, 2017 4:20 pm

It sounds like you're trying to use your Battery Tender while you're also charging the car. I wouldn't recommend that, because the built-in 12v converter is also trying to output 13-14 volts at that time. If your battery tender is showing strange light patterns, it's probably a sign that it knows something odd is happening.

(BTW, you didn't mention which model you have, but the Jr only has one light and can't show both red and green at the same time)
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

LeftieBiker
Posts: 7385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Battery Tender Jr

Tue Oct 31, 2017 4:44 pm

It sounds like you're trying to use your Battery Tender while you're also charging the car. I wouldn't recommend that, because the built-in 12v converter is also trying to output 13-14 volts at that time.


I do this all the time, and it works fine.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

brotherjethro
Posts: 29
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

Re: Battery Tender Jr

Tue Oct 31, 2017 5:25 pm

LeftieBiker wrote:
It sounds like you're trying to use your Battery Tender while you're also charging the car. I wouldn't recommend that, because the built-in 12v converter is also trying to output 13-14 volts at that time.


I do this all the time, and it works fine.


Interesting. What does it do? Does the Battery Tender finish all of its phases while the car is still charging?
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

LeftieBiker
Posts: 7385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Battery Tender Jr

Tue Oct 31, 2017 8:59 pm

Interesting. What does it do? Does the Battery Tender finish all of its phases while the car is still charging?


Yes. Mine is hardwired to an SAE connector through the charge port compartment, but I believe it will act normally even if clipped on.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

jjeff
Posts: 1486
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Battery Tender Jr

Wed Nov 01, 2017 5:33 am

brotherjethro wrote:It sounds like you're trying to use your Battery Tender while you're also charging the car. I wouldn't recommend that, because the built-in 12v converter is also trying to output 13-14 volts at that time. If your battery tender is showing strange light patterns, it's probably a sign that it knows something odd is happening.

(BTW, you didn't mention which model you have, but the Jr only has one light and can't show both red and green at the same time)

Yes my model of Battery Tender after charging is complete, desulphaphies?? the battery. I believe a red LED means it's hooked to the battery, a solid green LED means it's charging and a flashing LED means it's in the de-sulification mode, where it will stay until unplugged. What I don't know is once it's in the de-sulfication mode(flashing green LED) if the battery gets low will it start charging again......I know once the green LED flashes, the only way to get it to stop is to power cycle the Battery Tender, even if disconnected from the battery it will still flash, until unplugged.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
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LeftieBiker
Posts: 7385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Battery Tender Jr

Wed Nov 01, 2017 6:08 am

Yes my model of Battery Tender after charging is complete, desulphaphies?? the battery. I believe a red LED means it's hooked to the battery, a solid green LED means it's charging and a flashing LED means it's in the de-sulification mode, where it will stay until unplugged.


Maybe there's a newer model that does this, but for most BTJs the solid red light means bulk charging at full power, the flashing green means it's in finish charging mode at reduced power*, and then it goes solid green when the battery is full charged, and stays there.

* Maybe the flashing green means a de-sulfating mode, because 0.75 amps isn't that much, but since these are designed for small batteries as well as larger ones, I think that this mode is to keep small motorcycle-sized batteries from charging too quickly from 90% to 100%.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

brotherjethro
Posts: 29
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

Re: Battery Tender Jr

Wed Nov 01, 2017 6:43 am

jjeff wrote:What I don't know is once it's in the de-sulfication mode(flashing green LED) if the battery gets low will it start charging again......I know once the green LED flashes, the only way to get it to stop is to power cycle the Battery Tender, even if disconnected from the battery it will still flash, until unplugged.


Yes, the BTJ monitors the battery voltage in both green modes (solid & flashing) and will switch back to bulk charge "solid red" mode and start over if needed. You can see this happen by turning on the headlights while in either green mode.
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

brotherjethro
Posts: 29
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

Re: Battery Tender Jr

Wed Nov 01, 2017 6:47 am

LeftieBiker wrote:
Interesting. What does it do? Does the Battery Tender finish all of its phases while the car is still charging?


Yes. Mine is hardwired to an SAE connector through the charge port compartment, but I believe it will act normally even if clipped on.


Good to know! I've been curious, but didn't want to try it.

(And mine is wired the same way, LOL).
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

ebeighe
Posts: 31
Joined: Wed Jul 05, 2017 1:56 pm
Delivery Date: 27 Jul 2017
Leaf Number: 308422
Location: Phoenix, AZ

Re: Battery Tender Jr

Wed Nov 01, 2017 8:42 am

LeftieBiker wrote:12.8 volts isn't really "quite full." I've never had a BT JR fail, and I have several of them. Give it a bit longer.


BrockWI wrote:Yup, your battery was likely just that low. I can't remember if the newer ones time out after 24 hours or not, but it wouldn't surprise me if it took more than 12 hours to get he battery back to full.


yes, as you predicted... just needed several more hours. all good.
"Brilliant Silver" 2017 S built 04/17, delivered 7/27/2017

User avatar
RegGuheert
Posts: 5621
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Battery Tender Jr

Wed Nov 01, 2017 12:36 pm

jjeff wrote:...de-sulphfying?
jjeff wrote:...desulphaphies??
Jeff wrote:...de-sulification mode,..
I love these! :D

Yes, it's a weird word. Briefly, lead sulfate forms as a white paste when a lead-acid battery discharges. When the battery is recharged, the lead sulfate is separated back into metallic lead and sulfuric acid. If the battery stays partially discharged for some amount of time (depending on temperature, etc.), some of the lead sulfate converts from the paste form into a crystal. Once the lead sulfate crystallizes, it is not as easily split back into metallic lead and sulfuric acid. In other words, it ties up both electrolyte and lead that originally was available in the charge-discharge reactions of the battery, thus reducing the capacity. Desulfating chargers typically use either higher voltages or pulses or both to try to break up the lead sulfate crystals to restore some or all of the original capacity of the battery. This typically takes more than one recharge cycle, but the battery can eventually come back close to like-new condition if such chargers are used consistently (and electrolyte levels are maintained).

So...

...desulfating.

...desulfates.

...desulfation.
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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