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Battery Tender Jr. 022-0192 12V 0.75Amp Junior High Efficiency Battery Charger/Maintainer
$19.95
http://www.newegg.com/Product/Product.aspx?Item=9SIA08C2KH9411

California approved charger
12 Volt 0.750 Amp
Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell)
5 year warranty
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Battery Tender Jr. 022-0192
Thanks BMWLVR82
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I bought one of these over a year ago based on a car enthusiast's recommendation.  It is easy to use and still working well.

From a 3rd party vendor

prosperity said:   From a 3rd party vendor
  Sort of...

'Nutrend, a subsidiary of Newegg.com, is a leading online retailer of specialized automotive products.'

I have one of these maintainers that worked well for 5 years.  Failed right after the warranty expired.  WTH, does it have a timer inside?
 

Can confirm this item works great! I have it attached to my backup sump-pump battery, keeps it at a nice 13.1v. The built-in battery maintainer (built into the control panel/unit) for the backup pump *sucks*, so I connected this in parallel and it "plays nice" with the control panel (they don't interfere with one another).

I think the built-in maintainer never sees a voltage drop, so it never tries to charge the battery,

Thanks in for 2. needed one for a motorcycle and a car for winter storage.

CPAESQ said:   Thanks in for 2. needed one for a motorcycle and a car for winter storage.
  So long as the batteries are the same type/chemistry (wet, sealed, AGM, etc), you can hook them in parallel to a single charger.

Also, you can pretty much use any 12v AC adapter to make your own battery tender.



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