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eHam Forums => Misc => Topic started by: N9LCD on September 14, 2018, 06:40:10 AM



Title: OVERNIGHT BATTERY FAILURE
Post by: N9LCD on September 14, 2018, 06:40:10 AM
I know all batteries, regardless of chemistry, gradually wear-out and won't hold a charge, but I never heard of an overnight complete battery failure.

Before checking in for the night, I checked my cell phone.  The battery's charge was about 80 percent and I turned the phone off.

Comes morning, I couldn't turn the phone on.  Put my spare battery in and turned the phone on.  Good!

Checked the removed battery with my DVM -- COMPLETELY DEAD, 0 VOLTS!

Anybody else have a similar exprerience with "Li" batteries?

N9LCD  ??? 


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: N8AUC on September 14, 2018, 06:45:42 AM
What was the cell coverage like in the area where you were?

I've noticed that my cell phone drains its battery much faster when the signal is very weak.

Are you sure you really turned it off, or just put it in standby?


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: SOFAR on September 14, 2018, 10:46:53 AM
How old is the battery? All my Li-ion have the date of manufacture marked.



Title: RE: OVERNIGHT BATTERY FAILURE
Post by: NO2A on September 15, 2018, 11:28:41 AM
The battery is probably at the end of its life. I have to replace mine every year on my Android. My phone is constantly getting automatic updates, which turns on programs even if they weren't being used. Go into your settings and turn off anything not being used. Especially if your ram is using too much memory. I have that problem with this phone. 


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: K5LXP on September 16, 2018, 04:08:36 AM

As a unit, lithium batteries nearly always have some sort of over/under/charge management circuitry.  If a battery went to 0V suddenly I would suspect the circuit failed in some way.  Generally lithiums age pretty well and get progressively "softer" until they just don't have the guts to run the device for very long, but not usually "dead" suddenly.

Mark K5LXP
Albuquerque, NM
 


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: N9AOP on September 16, 2018, 10:50:02 AM
If you charge the battery and then remove it from the device for a couple of days and then replace it, what does it do?  That's one cheap way to tell if it is the device or the battery. 
Art


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: W3TTT on September 18, 2018, 06:56:41 AM
Things that drain the cell phone batty
Screen is on
Wi-Fi is on
Wire less data
Phone is on.  It polls the tower constantly
Apps running.  Even the clock with an alarm set.

I suppose you could set airplane mode and turn off all the apps. 


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: K4JJL on September 18, 2018, 08:37:54 AM
Phone is on.  It polls the tower constantly

I've noticed that when I go in a sports arena or other concrete buildings that my phone dies within 2 hours, so I would put it in airplane mode.  I used to carry a pager (900 MHz paging signals could get in pretty much anywhere) and set up Google Voice to forward voicemail notifications to that in case someone needed to contact me.  Then my friend sold his paging company and that option died.


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: AE5GT on September 18, 2018, 09:01:21 AM
N9LCD doesnt show as a valid license anymore , pirate. Shouldn't have cancelled your license.


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: K4JJL on September 18, 2018, 09:35:10 AM
N9LCD doesnt show as a valid license anymore , pirate. Shouldn't have cancelled your license.

Looks good to me.

http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=758307 (http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=758307)

 ???


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: SOFAR on September 18, 2018, 10:45:09 AM
Things that drain the cell phone batty

Phone is on.  It polls the tower constantly

Constantly?

An idle phone pings the tower about once an hour. If I leave my phone sitting within 3 feet of an AM radio, I can hear it.

The alarm app using power is more made up B.S.

If you go into settings you can see what's using battery power. Listed by percentage.
Cell phone standby is about 2%


Title: RE: OVERNIGHT BATTERY FAILURE
Post by: K4JJL on September 18, 2018, 10:53:15 AM
Things that drain the cell phone batty

Phone is on.  It polls the tower constantly

Constantly?

An idle phone pings the tower about once an hour. If I leave my phone sitting within 3 feet of an AM radio, I can hear it.

The alarm app using power is more made up B.S.

If you go into settings you can see what's using battery power. Listed by percentage.
Cell phone standby is about 2%

If it pings the tower and gets no response, it ups the TX power and tries again repeatedly until a response is heard.  That's not including the apps running that are polling for new emails, tweets, spacebook/snapgram notifications, etc. especially if there's a lossy connection.