Bah, that is disappointing. SLA batteries do NOT like to be stored on
float either. For one car battery , empirically seems to work to
trickle charge once a week for 12 hours or so---so far has worked well
for 6 years. Slight discharge to 70% with topping off is about right
IIRC. If an elegant charger that would monitor the state of battery
and do this as needed doesn't exist, it should.
Perhaps Jeff's link to a way to refurbish one with mild sulfation will
work--at least worth a try. Doesn't look great.
Wonder what finally happened in Moose's mysteriously discharging
battery saga?
Mike
Something to look at:
http://www.batteryuniversity.com/parttwo-35.htm
No firsthand experience. My Quantum lead acid batteries have held up
very
well, the NiMH have all died (bought used).
Jeff Keller
-----Original Message-----
From: Chuck Norcutt [mailto:chucknorcutt [at] chucknorcutt.com]
Sent: Tuesday, September 15, 2009 8:21 AM
To: Olympus mail list
Subject: [OM] 12 volt battery advice
I have a 12volt, 12 amp hour gel cell battery (like those used in
uninterruptable power supplies) that I use to power my Alien Bee studio
flash units outdoors through a true sine wave inverter.
I checked the battery yesterday under no load and got about 12.5 volts.
So I put it on the charger overnight (1.5amp) and was surprised to
see
that it had only reached 12.85 volts after about 15 hours on the
charger
(despite the charger's light saying it's fully charged). I attached a
couple of lights and fired off 1/2 dozen shots only to hear the
inverter
chirping about low battery voltage whenever the lights started to draw
power. After the 1/2 dozen shots the no-load voltage was already back
down to 12.54 volts.
This battery is about 3 years old but rarely used and rarely charged.
Do you think it's toast?
Chuck Norcutt
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