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Miata Battery and Battery Tender Question



 
 
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  #1  
Old November 6th 15, 03:34 AM posted to rec.autos.makers.mazda.miata
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Default Miata Battery and Battery Tender Question

Hi Folks. I have not been in here for a long time, but HELP>>LOL. Since the OEM battery, in my 2000 Miata, with less than 44,000 original miles, I have been using the Duralast battery from AutoZone. And since I drive it so very little (Obviously with those miles), I keep a Battery Tender Jr. on it. Well now that it is cold here, with fall setting in, it appeared that this 4.5 yr. old battery was giving up the ghost, with the tender going into flashing Red, then green and back and forth. I thought maybe it was because I had moved the tender to the floor from the lip of the trunk in Summer and that maybe the floor now (Concrete) was way too cold for it, so moved it back, and I thought that solved it, going back to solid green, but a couple of days later SAME thing, hence decided today new battery time. Now the guy there, tested and said the battery tested good, what did I want to do. Well since I planned to replace it at 5 yrs. anyway, I still bought it and put it in, figuring it was probably just low enough to make the tender do that thing.

Well got home hooking the tender back up and the same thing, so now appeared that this 4 yr, old tender went bad. Went down and got another Tender Jr. and by all appearances looks exactly the same, but is feather weight compared to my 4 year old one. Long winded, sorry, but now some ???s: 1) In the future how can I protect my wallet by knowing which one really needs replacing?? and 2) Even though this battery is brand new and fully charged, this new tender was also red, probably would have gone green in maybe 15>30 minutes or so, but impatience me fired up the car, and it went green pretty quick and has stayed green just fine. But I did decide to re-route the extension cord, unplugging it, and upon re-plugging it, it went RED again. Fired up the car briefly again, being IMPATIENT. Now is it a bad idea to have the Tender on and connected at the same time the car is running??? I have gone over its' instructions with a fine tooth comb and it does not say??? Does this brand new Tender Jr. model just function slightly differently, taking a bit longer to go from Red to green.

TIA for ANY info :-) And by the way, since about noon has been fine and solid green since the last engine turn on.
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  #2  
Old November 7th 15, 03:56 PM posted to rec.autos.makers.mazda.miata
Leon van Dommelen[_2_]
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Default Miata Battery and Battery Tender Question

On Thu, 05 Nov 2015 18:34:57 -0800, moeshefrankenstein_1 wrote:

> Hi Folks. I have not been in here for a long time, but HELP>>LOL. Since
> the OEM battery, in my 2000 Miata, with less than 44,000 original miles,
> I have been using the Duralast battery from AutoZone. And since I drive
> it so very little (Obviously with those miles), I keep a Battery Tender
> Jr. on it. Well now that it is cold here, with fall setting in, it
> appeared that this 4.5 yr. old battery was giving up the ghost, with the
> tender going into flashing Red, then green and back and forth. I thought
> maybe it was because I had moved the tender to the floor from the lip of
> the trunk in Summer and that maybe the floor now (Concrete) was way too
> cold for it, so moved it back, and I thought that solved it, going back
> to solid green, but a couple of days later SAME thing, hence decided
> today new battery time. Now the guy there, tested and said the battery
> tested good, what did I want to do. Well since I planned to replace it
> at 5 yrs. anyway, I still bought it and put it in, figuring it was
> probably just low enough to make the tender do that thing.
>
> Well got home hooking the tender back up and the same thing, so now
> appeared that this 4 yr, old tender went bad.


I had one on my 1996 and after some years, it started cutting out the
engine while I was driving. So I threw it away and did not get another.
Instead I put in a lights-on buzzer.

> Went down and got another
> Tender Jr. and by all appearances looks exactly the same, but is
> feather weight compared to my 4 year old one. Long winded, sorry, but
> now some ???s: 1) In the future how can I protect my wallet by knowing
> which one really needs replacing??


See whether the battery starts the car with the tender disconnected?

> and 2) Even though this battery is
> brand new and fully charged, this new tender was also red, probably
> would have gone green in maybe 15>30 minutes or so, but impatience me
> fired up the car, and it went green pretty quick and has stayed green
> just fine. But I did decide to re-route the extension cord, unplugging
> it, and upon re-plugging it, it went RED again. Fired up the car briefly
> again, being IMPATIENT. Now is it a bad idea to have the Tender on and
> connected at the same time the car is running??? I have gone over its'
> instructions with a fine tooth comb and it does not say??? Does this
> brand new Tender Jr. model just function slightly differently, taking a
> bit longer to go from Red to green.
>
> TIA for ANY info :-) And by the way, since about noon has been fine and
> solid green since the last engine turn on.


Leon

 




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