Monday December 9, 2013 05:52
January 10, 2014 09:50
How do they know?
progress to let you know how they think
And what is really happening and how to measure it.
Battery empty? And what does charger do? Burned rug prompted this
|Friday January 10, 2014 09:50
Tracfone LG840G display one bar with Onite 1500 mAh
Continued use of phone necessitated replacing the Onite with
the 1000 mAh Li-ion battery
which came with the phone.
seen clamped to 9V secured for INNOVA 3320 voltage test.
was reduced to 4.12V after a day use.
Onite 1500 mAh charged with
Adreama $.99 mobile charger using the Werker 12V 9Ah AGM
Battery Full message display on LG840G caused Patty to unplug
cell phone from Adreama.
First case where Battery Full message display
with USB charge of LG840G.
Battery died in Patty's Tracfone LG840G
|Sunday January 5, 2014
Researchers developed an off-vehicle solar concentrator that uses
a special Fresnel lens to direct sunlight to the solar cells while boosting the
impact of the sunlight by a factor of eight. Fresnel is a compact lens
originally developed for use in lighthouses. Similar in concept to a magnifying
glass, the patent-pending system tracks the sun as it moves from east to west,
drawing enough power from the sun through the concentrator each day to equal a
four-hour battery charge (8 kilowatts).
[Those deadbeat liberal-arts students]
Saturday January 4, 2014 18:51
Holding battery steady while trying to measure voltage
technique improved by purchase of Harbor
Freight spring clamps one of which is used to secure LG840G
battery to 9V battery for stablity.
|Transition from 3 bars to 2 voltage measurement of
Onite 3.7V 1500mAh battery.
Battery full charge is over 4V.
Three bar Onite charged to battery full
LG840G 1000 mAh amp retrieved from garage
was cold. Voltage measured.
Allowed to warm to room temperature.
Voltage remained the same.
Thna charged to 'battery full' message with
|Friday December 20, 2013 07:59
1500 Ah 3.7V battery finally on one bar in Tracfone LG850G..
3.66 measured with
Video. Correction: Gray Beans not Onite.
Second full charge measured 4.21V.
beeps at 07:58 indicates battery about dead.
Battery empty warning beep
voltage = ?
Monday December 16, 2013 11:03
Lead-acid batteries: Monitoring state-of-charge and
|About the Author Rajakrishnan (Raj) Radjassamy is the
Business Development Manager for TIs Battery Management Solutions where
he supports battery monitors, gas gauges and protectors. Raj received his Ph.D
in Computer Engineering from the University of Arizona, Tucson. With nearly two
decades of engineering experience, he has been awarded nine patents, with
another six in review. Raj can be reached at firstname.lastname@example.org.
1 Agressive automotive
2 Battery full voltage likely indicates automotive
But measuring points are same here.
Was 13.35 at end of charge.
|Friday December 13, 2013 14:02
Charging Tracfone LG420G with car charger
Temperature probe attached to 3.7V 900 mAh
1 Start of
.41A continue to go into
5 4.21V at
Charge circuits cuts-off current to battery when full.
|On this phone.
This may not be true for
other phones or even different series of the above phone.
phone is required to make fairly sure. Not absolutely sure, of
KillAWatt meter used on this page design was changed because
early series where destroyed by modified sine wave input.
|Friday December 13, 2013 08:11
Beeps from Tracfone
LG840G alerted that Onite required charge Thursday
LG840G left on charger over night.
Does this mean that current continued to flow into battery
even though it was 'full'?
Request is to unplug charger, not phone.
Battery removed from LG840G. 4.21V measured. 4.21 = 3.7 X. About a 14%
Discharged battery storage not a good idea we
Harbor Freight about $20 charger set on 2A used to charge
for charge video.
2 Power on 13.89V.
|Friday December 13, 2013
Battery full? How does the Tracfone LG420G know?
removed and measured 3.43V.
Importance of paper clip in
Ready to test.
|Thursday December 12, 2013 14:19
car charger from Harbor Freight exceed USB specification voltage
$14.88 Tracfone LG420G comes with a car charger so we
tested using using 12V 9Ah Werker battery.
0V out. ?
charger tested. 0V out.
Honda CR-V charger
working powered by Werker video.
5.70V exceeds USB specification
LG840G 1000 mAh above 900 mAh LG420G
Breakout cable for the LG420G required to test battery
Magnifying glass required.
Kester #2331-ZX solder flux used.
Best flux we found through experimentation.
electrical tape was used in the past.
Heat shrink technology used by
Jake at Hallmark to cover DSO Nana V3 1X 10X probe was used.
Ground lead shorter than power so that test clips don't
short ... easily.
Solar battery charging was initial reason for
At about 14.8oF solar water pump
We do tend to think that solar panels are going to work
very well on a blistering hot summer day. Surprisingly this is actually not the
Solar panels will lose efficiency in temperatures above 30
degrees. The cooler weather actually suits them better.
Summer max is around 8+V.
Recharged NiMH or NiCd 9V battery powers meter.
Terk Technology HDTVi VHF/UHF HDTV Indoor Antenna rabbit
ear broken. But still worked well.
Plastic stickem on back of meter contains date and perhaps voltage of
Primary function of meter is to discharge battery so that it
can be recharged.
PBS Channel 5 sometimes does work
Terk FDTV1A Flat Digital Omni Directional Amplified Indoor
Antenna-Black arrived from Amazon.
Installed morning of LG402G
Installed with and without amplifier. Marginal, if
any, performance improvement over old terk.
Channel 5 problems persisted
until antenna properly positioned.
Works better than previous
And what can go wrong. :(
|Charging advice for
Onite 3.7V 1500 mAh Li-ion battery.
Readers: Not clear if a mobile
device stops charging once it determines the battery is 'full'.
videos show that the Harbor Freight charger illuminates green LED and stop
current from flowing into charged battery.
Seeed Studio DSO Nano is
reported to only have a resistor between USB 5.0 and a 3.7V Li-ion
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