OT Battery Tenders

DrLarryE · Mar 26, 2020

I have several small 12V batteries that I store in a heated work room for the winter. Can several batteries be hooked together to be "tended" by 1 unit?

Mike Groom · Mar 26, 2020

Yes you can hook them up in series,pos. to pos.-neg. to neg.one winter I had 3 batteries on one tender,just had to make up a set of small charging connectors.

Bruce (VA) · Mar 26, 2020

Battery Tender Inc sells a unit to do that. I'll see if I can find the link.
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JMOR · Mar 26, 2020

(quoted from post at 09:39:58 03/26/20) Yes you can hook them up in series,pos. to pos.-neg. to neg.one winter I had 3 batteries on one tender,just had to make up a set of small charging connectors.

... in series,pos. to pos.-neg. to neg." Series? Really? :roll:

Dean · Mar 26, 2020

Not advised unless you well know the design of your batteries and tender.

Dean

Bruce (VA) · Mar 26, 2020

At this price, I'd buy individual chargers

https://www.batterytender.com/5-Bank-Charger-12V-2A
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TimPa · Mar 26, 2020

if your tender puts out somewhere in the 13-16 vdc range, then there is no reason it can't tend more than one battery. it will do so in less than effective manner. that is the battery should not be dead or near dead.

and you want to connect the 2 batteries in parallel. positive lead from the tender to the positive battery terminals, and negative to negatives.

if connected in series will half the voltage going to the batteries and not provide any charge.

HFJ · Mar 26, 2020

i use a battery minder brand - i believe it's exclusively from northern tool. it will handle multiple batteries in parallel.

HFJ · Mar 26, 2020

haha. ya, i'll be ordering 3 or 4 this afternoon

Jim L WA · Mar 26, 2020

Ditto what HFJ said, but the batteries need to be the same size. You shouldn't have, say a lawn tractor battery and car or tractor battery wired in parallel to the same maintainer.

Bruce (VA) · Mar 26, 2020

Yea, that must be some super technology to cost that much. I just hard wired all my tractors, model A's and the golf cart. Got 9 total. Worry fine. Oldest battery is almost 10 years old.
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JK-NY · Mar 26, 2020

No offense but ?you?ve got your wires crossed ? literally. You described hooking up batteries in Parallel , which would be correct for what is intended by the original poster, but called it series, which is positive to negative and doubles voltage, where parallel doubles amps , with same voltage.

DrLarryE · Mar 27, 2020

(quoted from post at 23:14:28 03/26/20) No offense but ?you?ve got your wires crossed ? literally. You described hooking up batteries in Parallel , which would be correct for what is intended by the original poster, but called it series, which is positive to negative and doubles voltage, where parallel doubles amps , with same voltage.

I knew to hook them up parallel if I did it but did not consider different size batteries as long as they were 12V and reasonably well charged to begin with. Thanks for all the info.

Tim PloughNman Daley RIP · Mar 28, 2020

"Battery Tender" is the trade name by DELTRAN but one of the best on the market. The correct term for this type is a battery Float Charger. A battery 'Trickle Charger' is NOT the same thing. Read the box before you buy. A standard battery 'maintainer' or charger is usually a trickle charger type meaning it could not shut off automatically and overcharging the unit causing damage. I also recommend using one unit per battery. I've been using the DELTRAN BATTERY TENDERs on my N's for over 5 years now and have been one of the best investments made. For $30 you can't go wrong. The "JR" model is the 6V unit.

BATTERY TENDER JR (6V) BY DELTRAN:

Tim Daley(MI)

OT Battery Tenders

DrLarryE

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Mike Groom

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Bruce (VA)

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JMOR

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Dean

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Bruce (VA)

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TimPa

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HFJ

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Jim L WA

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