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0. 10:28 AM - Please Make A Contribution To Support Your Lists (Matt Dralle)
1. 10:26 AM - Re: Re: Walmart battery charger. (Jeff Page)
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| Subject: | Please Make A Contribution To Support Your Lists |
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| Subject: | Re: Re: Walmart battery charger. |
I bought the Schumacher SEM-1562A while at AirVenture this year. It
was all that was available when I needed to recharge a battery I
brought along from a UPS that I was using to recharge my iPad.
Although the battery had previous abuse prior to AirVenture, I did
expect it to perform adequately. I recharged it five or six times at
AirVenture and each time, it seemed like it was not fully charged.
When I got home, I determined that the battery was no longer able to
hold a charge.
Now that fall is here, I have some car-size batteries out of a couple
of boats in my basement. They had already been fully charged and were
on another maintainer, so are in good shape.
Just for fun, I put the Schumacher on one of the batteries, expecting
it to go to maintenance mode almost immediately.
Instead, it began trying to recharge the battery, with 14.7 volts. It
briefly went as high as 15.2 !
There was not a lot of current (maybe 150mA if I remember), since the
battery was already charged. I expected that current to drop off and
then voltage to drop to a maintenance level.
I stood and watched for 20 minutes. I gave up waiting after the
current dropped to one-third of the original value, with the
Schumacher still putting out 14.7 volts and then disconnected it.
The manual states that the maximum charging voltage is 14.8 volts,
which seems very high to me, but probably would not harm a car
battery. A smaller battery might overheat ?
The manual states that this device is for charging and maintaining
small batteries (eg. motorcycle), but that while it is suitable for
maintaining large batteries, such as car and marine deep cycle
batteries, it's charge current is too low to charge those.
Unless I understand incorrectly, 14.8 seems to high to charge a small
aircraft battery, although perhaps the voltage is unimportant if the
current is limited.
I did pull it apart to look. Lots of high precision resistors, but no
potentiometers to adjust.
Until I learn more, I will not be using this Schumacher on any
batteries I do not want ruined.
Jeff Page
Dream Aircraft Tundra #10
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