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Old 07-06-2016, 02:09 PM   #11
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Thanks everyone for your replies. So it appears how I have the tender connected is OK. Why would the instructions that came with the tender request I use a 2 foot extended cable to the negative terminal? Right now I just have the two connectors hooked directly to one of the batteries, not the clip type but the connectors that actually fastened below the nut on the battery terminals.
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Old 07-06-2016, 02:17 PM   #12
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Quote:
Originally Posted by tgduffy View Post
Thanks everyone for your replies. So it appears how I have the tender connected is OK. Why would the instructions that came with the tender request I use a 2 foot extended cable to the negative terminal? Right now I just have the two connectors hooked directly to one of the batteries, not the clip type but the connectors that actually fastened below the nut on the battery terminals.
My best guess is that they are trying to insure that the two leads of the unit don't touch.

Lawyers.
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Old 07-06-2016, 02:31 PM   #13
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I did a search for Battery Tender manual, read 3 different files and found nothing that specifies a 2 foot cord...

What exact model are you using?

however one piece claimed it would...

Simultaneously charges and / or maintains
up to 5 or 10 batteries !!
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Old 07-06-2016, 02:33 PM   #14
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It's item 16(b) on this:

http://www.batterytender.com/021-0128-man.pdf
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Old 07-06-2016, 02:59 PM   #15
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OK, so on Page 4 they claim:

Quote:
ATTENTION: The Battery Tender® Plus CHARGER HAS A SPARK
FREE CIRCUITRY. The output alligator clips or ring terminals will not
spark when they are touched together.
Then they have you attach a 24 inch long lead as a:

FOLLOW THESE STEPS WHEN BATTERY IS OUTSIDE VEHICLE. A SPARK NEAR
THE BATTERY MAY CAUSE BATTERY EXPLOSION. TO REDUCE RISK OF A
SPARK NEAR BATTERY:
a) Check polarity of battery posts. POSITIVE (POS, P, +) battery post usually has a
larger diameter than NEGATIVE (NEG, N, –) post.
b) Attach at least a 24-inch-long 6-gauge (AWG) insulated battery cable to NEGATIVE
(NEG, N, –) battery post.

Sounds like their lawyer made them put this in...
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Old 07-06-2016, 04:46 PM   #16
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So I heard back from the Battery Tender folks. They said "You would need to connect positive to one battery and negative to the second battery. Do not connect to just one battery. The Jr is most likely not enough charging amps for both of those batteries. I would recommend using nothing less than 1.25 amp. Battery Tender Plus."

Do I really need to connect to both batteries even though they are in parallel, or are they just trying to sell me on a bigger tender?

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Old 07-06-2016, 04:56 PM   #17
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Just connect each lead to each battery. Pos to one neg to the other you will be fine. As long as bats are full charge when you connect tender, you will be ok. I have been using these tenders for years and they do a fantastic job.
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Old 07-06-2016, 04:57 PM   #18
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I finally did hear back from the manufacturer. They want me to attach the positive to one battery and the negative to the other battery. They also commented that the Tender Junior may not be large enough for my two 12v batteries. I would really like to just keep things the way they are. Feedback?
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Old 07-06-2016, 05:01 PM   #19
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Just connect each lead to each battery. Pos to one neg to the other you will be fine. As long as bats are full charge when you connect tender, you will be ok. I have been using these tenders for years and they do a fantastic job.
What he said!
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Old 07-06-2016, 05:11 PM   #20
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Sorry but I need to clarify. Follow the manufacturer by attaching the positive tender lead to battery A's hot and the negative tender lead to battery B's negative post? How is this different from my current connection of both pos and neg to the same battery?
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