Tuesday, Oct 15, 2013 at 21:06
You are not alone in having doubts about smart chargers.
don't get me wrong they are a great thing.
No other type of charger will stick more change to a battery faster and safer AND keep a battery in good condition than a good smart charger.
BUT, they can ALL be fooled ( every single one) by irregular situations and cause damage.
I have not experienced this myself, but I have heard several stories that make sence.
These smart chargers ......as I have said before are looking for a direct relationship with one healthy battery and they rely on that battery behaving as the charger expects.
If we have a matched pair of battereis that behave more or less like a single battery....that is all fine and beaut.....but as soon as one battery is not tracking the other in some way.....one of the batteries will be more stressed.....as it is more stressed it will track less like the other...meanwhile the smart charger may be looking at the easy riding battery thinking it is all fine..so it keeps pushing....and the stressed battery gets more and more stressed.
If either battery was connected on its own....the smart charger would continue to do the best by the battery and it may have a long life even though it shows its age
If both batteries where connected to an old style fixed voltage charger.....charging may be slower, and the charge level may not be as high AND one battery may work harder...AND no doubt one battery WILL fail before the other....BUT the more vunerable battery wont have charge bashed into it at a rate that does not suit it... and its failure will not be fast and dramatic.
There are also issues with batteries in failure, there have been cases...like the one posted where a battery is beginning to fail, and the smart charger continues to bash that battery trying to make it work.
This accelerates the failure or may make that failure more dramatic or perhaps dangerous.
I have read several accounts where smart chargers have pushed batteries with dropped cells and continued to push those batteries till they where sizzling hot and very dangerous indeed.
Yes similar things may happen with constant voltage chargers but not to the same extent.
I have several smart chargers and several that aren't (and one that is positively stone age) and I charge a variety of batteries continuously....I always have something charging.
BUT I am realy thinking that IF I was running a battery continuously on charge I would go to an old style constant voltage charger built from a transformer, rectifier and a good old linear regulator.
I have worked on may battery systems that remain on charge 24/7/365 year in year out that have been floated on good old analogue constant voltage chargers, and I have not seen the spactacular failures that seem to occur with these smart chargers.
Just some thaughts.
here is a bit of important advice.
REGARDLESS, you need to actively supervise your batteries.
You need to
check their condition and actively decide to charge them.
Unless you are running some sort of no break power supply application like an alarm system, computer servers or life support...there is no need and no benifit to having a battery permanently on charge.
In fact having a battery permanently on charge will reduce its life.
If ya battery wont hold a reasonable amount of charge for 30 days unused in a cool place, its getting tired and it will be
well down on capacity, if ya battery will not hold a reasonable amount of charge unused for 14 days....its buggered.
So, if ya not using ya battery, give it a 24 hour or 48 hour charge on a good quality charger once a month or once a fortnight.....otherwise leave the poor bugger in peace.
cheers
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