|Posted: Sat Jan 26, 2019 8:24 am Post subject: Battery disconnect with dual battery and trickle charger
I bought a 'no name' SLA battery through ebay back in mid November for a Kolb project that won't fly until spring. I just checked its voltage, and it's still at 12.8V. How long do you plan for the plane to sit between flights? While some have had decent luck using 'maintainer' chargers on SLA batteries, many have seen greatly reduced lifespans when using maintainers. If the battery technology doesn't need it (extremely low self-discharge rate), why risk it? Odyssey's technical documents will show you the self-discharge rate for one of their healthy batteries.
If you have a demonstrated incident of
death-by-maintainer, then the maintainer
was (1) badly designed or (2) defective.
An 'ideal' recharge/maintenance plot
looks like this:
Here's a measured performance on
a Schumacher XC75 charger on a
100AH truck battery
Here's a plot on a Schumacher WM1562A
on a 20AH SLVA
Here's a Battery Tender Jr. on a 7AH
While some do not closely follow the
'ideal' plots, they do achieve a top-off
followed by a drop-and-hold to the
maintenance level. I've been
using various charger/maintainer
products for decades on both vehicles
and lab batteries with expected
results: Some of my lab batteries are
over ten years old and still deliver
a substantial fraction of their
name-plate capacity. I.e. still
I've yet to test any Harbor Freight
maintainer that produces the necessary
performance . . . doesn't mean that
there are none . . . just that the
two I tested went into the round-file
and that was over 10 years ago.
While it's true that well constructed
SVLA batteries may not benefit greatly
from the use of a maintainer, it's
not a BAD thing to do either and
in some cases a necessary thing to do.
Bob . . .
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