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A trickle charger will keep charging which is bad for the battery and ultimately will destroy it over a long period of time.
The battery tender (plus or junior) will charge the battery until it reaches the optimum level. It then monitors the battery and charges again if needed. Green and red lights on the charger indicate the mode.
I have two. Bought them on ebay from Ralco. 100% rating for the seller with high volume of sells. I paid $44 with free shipping for the Battery Tender Plus. I highly recommend it. It was recommended by others in this forum is why I bought it to originally.
CTEK (from Sweden) has been a tender of choice in Europe and is now getting rave reviews here>>
Compact and works great and comes with a 'permanent' hard wire connectors for the battery so it becomes a 'plug and play' item (don't need to use the battery clamps.
I agree. I've been using a 'Battery Minder' for about 2 years on everything from lawn mower batteries to those huge 4-D truck/tractor dudes. Everybody who keeps a vehicle more than a couple years should get up to speed on how sulphation affects lead acid batteries.
For clarification - 'Battery Minder' is a patented trade name, a brand name. I think 'battery tender' is more like a catagory of charger. Tenders are regarded as low amp chargers with good circuitry for cycling off and on, as the dormant battery requires. So the 'Battery Minder' is a brand of tender whose circuitry also incorporates the pulsating, de-sulphating charging process.
I see that some other tenders also use a de-sulphation mode. They may be as good, maybe better than the 'BM'. I don't know. I do know the 'BM' works as advertised. Depending entirely on the state of the particular battery, I have brought batteries back from near dead to at least serve one more season. Often they are too far gone though. Where they really shine though, is in preventative maintanance - keeping that crystaline junk from building up in the first place...
So check it out - make sure the tender you're looking at incorporates de-sulphation. My 2 cents.