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If it were my battery I'd be replacing it. I don't have a lot of
patience with trying to bring batteries back to life. That said, if said
battery belongs to my employer I'll do what I can to help it.

We worked as campground hosts at a State park. We were issued a handheld
radio, but were told that it didn't seem to hold a charge. I put it on
the charger, and watched the light. After several hours it still wasn't
indicating a charge. It did work for an hour or so, though. After a week
of charging overnight and whenever I could during the day I finally got
it to where it would hold a charge all day, even with several calls. I
did suggest to the ranger in charge that he probably ought to be
budgeting for some new batteries, if not new radios.



On 8/6/19 20:38, Alan de G1FXB via Groups.Io wrote:

Sorry for apparent brevity, but I'll try to provide the background
picture, If short of time fast forward to he final paragraph?

(Coming from a marine environment perspective,
Assuming conventional wet Lead / Acid chemistry or one of simple

cousins.)

The Deep cycle description is not an invitation that it will survive
repeated deep discharge, without *severe* service life penalty.
Usable capacity is generally considered 30% of AH capacity, If a battery
advertised as 100AH, then real life is you will be able to draw 30A for
an Hour.
/May not meet with universal approval...
If a manufacture specifies 1A for 30 Hours then that's not the same, and
perhaps questions confidence of their figures for a deep discharge
battery./
In probability it will last +5-7 years if kept above 50% state of charge
in short term, store as close to 100% charge as possible
which is where the modern automated maintenance chargers excel.
Some will last +10 years and don't have to be premium brands, just how
good their owners charge / discharge and cell maintenance was.
(yes the sweet spot between 80 - 50% charge they rarely get the chance
to top off above 80% SOC in real (marine) service.
Discharge below 50% and how ever fancy the miracle cure is promised be
it Magic tablets to drop in the cells or automated reverse
de-sulphaters" they don't recover.
Many batteries even if advertised as "Sealed for Life" have old
fashioned removable cell caps hidden beneath a lid.
Often disguised and hard to remove for sealed for life,
alternatively less hard types to remove and advertised as "Low

Maintenance"

Regular good maintenance never killed a battery, a battery advertising
requires maintenance is a positive selling point in my book, so long as
you do.
It's also a good guide to it's health, if one cell begins to require
topping up, you know perhaps it's not long for this world....

3 days at 5-6A charge current and only reaches 9V.
Firstly charge outside & don't smoke or make sparks....
Assuming you are using an old skool auto charger, simple rectified but
unsmoothed DC & desirable in this situation but needs manual over-seeing.
Electrical energy is going in and being absorbed somewhere, does the
battery feel hot along the body at any point?
One or more cells gassing but not others?


Manufactures will stamp the production date on the battery, they have to
know it for dealing with warranty claims.
It will be there in some form, maybe disguised, google will be your

friend.

How hard do you want to try to recover it, there are not many "repair"
options. Perhaps only one.
Drain cells and dispose of acid and any sediment responsibly, flush
cells with running water to best "try" to remove dead plate material,
replace with correct SG acid / water mix
and charge.
In all honesty, it sounds the value is in it's scrap lead content. To
which there is some, perhaps not as a single battery but 5 / 10
depending on recycle centre.
what capacity do you expect in return? It will not be back as advertised
and that may be far from what you had originally expected
There is no such thing as a cheap battery, "best value" for deep
discharge use are perhaps traction batteries for golf carts etc or solar.
Get a price for a similar specification Marine battery for comparison.
Say to the vendor its for marine use and they think you have cruseliner
sized wallet, at least in the UK....

Alan

On 09/06/2019 00:29, k6whp wrote:

Gents,

In advance of FD, I "inherited" a deep-cycle marine/RV battery and
wondring if it's met its maker. Ostensibly in good condition (so
sayeth the donor), it's been on an automobile battery charger for
three days drawing about 5-6 amps with a terminal voltage of 9 volts.

I did the research but a lot of the info is "buy our miracle charger"
or "revitalize your dead batteries with our wonder product", etc.

Any verdict on this; a few more days?

--
David Lininger, kb0zke
Rev. 2:10
kb0zke@...