Thanks for all the replies...(but I'm still confused - the mythological component to the whole battery thing seems strong). Basically I'm just trying to nurse this bank until lithium comes down a bit (and someone else has been the guinea pig).
Relatedly, this looks interesting:
http://www.green-
but I can't find any other references to this technique. Lots of cables, but I think I have enough to give it a try (or the alternate recommended by the commenter).
-Keith
--- In electricboats@
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> In most items the weak link is the first to go. In terms of battery banks the bank is only as good as the worst battery. What I have found happens is the bad batteries fool the charger into believing the bank is charged or needs charged. What this means to the new batteries is over charging or under charging, both are bad for the battery and will lead to an early demise.
>
> Another problem is low capacity on your older batteries. The newer batteries will cover for the weaker batteries shortening the cycle time. If you desire to rebuild battery banks consider rebuild-able cell batteries. My money is on a new bank. if you want to get full life out of your older batteries consider switching banks so you can continue to use the older bank, saving the new bank and it's capacity for longer runs.
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> Kevin
> http://simplyrv.
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> For RV information
>
> --- On Fri, 7/17/09, hardy71uk <p0054107@..
>
> From: hardy71uk <p0054107@..
> Subject: Re: [Electric Boats] When good batteries go bad
> To: electricboats@
> Date: Friday, July 17, 2009, 1:09 AM
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> > > > From: Tad G <tad@>
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> > > > Reply-To: <electricboats@ yahoogroups. com>
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> > > > Date: Thu, 16 Jul 2009 18:00:07 -0400 (EDT)
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> > > > To: <electricboats@ yahoogroups. com>
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> > > > Subject: Re: [Electric Boats] When good batteries go bad
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> > > >
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> > > > One of the reasons to not do that is that you end up with the good battery
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> > > > charging the bad one, the worse case scenario in terms of losses. As soon as
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> > > > the charger isn't keeping the bad one topped off the good one will start do to
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> > > > so, but obviously it won't be able to and they will both loose charge until
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> > > > they are depleted. --- In electricboats@ yahoogroups. com, "aweekdaysailor" <aweekdaysailor@ ...> wrote:
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> No. this is a very popular myth. If the "good" one for example loses 1AH per day and the bad one 10AH they will still do that when paralleled together . If two batteries are unequally charged and then they are joined together current will flow between them only until the charge is shared . You can see this most easilly if you connect a large capacity say a 200Ah in parallel with a small one ,say 20AH . the large one does not "swamp" the small one . it is like two buckets of water connected by a pipe .as long as the top of the buckets is the same, water only flows until the level is the same in each bucket ( even different sized buckets). Equivalent in the battery case to settling to the same voltage.
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> Chris S
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