Thanks for the update, Chuck. Good luck with the shoot. In such cases, a
spare battery is nice insurance.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus mail list" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, September 16, 2009 6:51 PM
Subject: [OM] More on the 12 volt SLA battery
>I got the new battery today but it appears that I may have rejuvenated
> the old one using the 6 amp automotive charger. The new battery arrived
> with a charge state of about 12.6 no load volts. I had had the old
> battery on the 6 amp charger alternating some charge and rest states and
> it now shows about 13.5 volts. I put the new one on the 6 amp charger
> as well and it also shows about 13.5 volts. I've learned not to believe
> voltage measured right after it comes off the charger. For some period
> of time you can watch the voltage drop back about 0.01 volts per second
> or two. I don't know how long it takes to stabilize.
>
> I tried about 6 shots from a pair of AB 800s with the old battery and
> there were no low voltage chirping complaints from the inverter. But I
> think they were only at 1/2 power. I'll have to check and raise the
> power level and the number of test shots. I'll feel comfortable with
> the old battery if it can give me about 20 full power shots on two
> lights without low voltage complaints from the inverter. That's enough
> to get me through a short shooting session where the power needed will
> more than likely be 1/4 power or 1/2 power at the most. When the
> battery was new it could deliver 80 of those paired test shots before
> the inverter would complain about low battery voltage.
>
> In any case I'll keep the new battery just in case. I figured out the
> old one was bought in August 2004 making it more than 5 years old which
> is its maximum expected life span.
>
> Chuck Norcutt
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