Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 
16750 posts

Uber Geek
+1 received by user: 1958

Trusted

  Reply # 1841712 9-Aug-2017 11:28
Send private message quote this post

1-day Philips batteries are useless. They have no charge in them. Don't even power clocks for more than a few months, or children toys for more than a week.


20058 posts

Uber Geek
+1 received by user: 3734

Trusted
Subscriber

  Reply # 1841848 9-Aug-2017 13:45
Send private message quote this post

I've seen heavy duty Philips ones come up for sale before. They are useless. No idea why they even bother making them.

Alkalines start off at about 1.7v and seem to be floating at 1.4 when I pull them from remotes because I'm sick of having to aim it.




Richard rich.ms

 
 
 
 


16750 posts

Uber Geek
+1 received by user: 1958

Trusted

  Reply # 1841850 9-Aug-2017 13:52
Send private message quote this post

One can tell how much capacity is in a battery using a multimeter?


56 posts

Master Geek
+1 received by user: 10


  Reply # 1841858 9-Aug-2017 14:10
Send private message quote this post

I have made a few purchases of Duracell Industrial batteries worth a look at

http://www.duracellbatteries.co.nz

20058 posts

Uber Geek
+1 received by user: 3734

Trusted
Subscriber

  Reply # 1841904 9-Aug-2017 15:20
Send private message quote this post

Batman:

One can tell how much capacity is in a battery using a multimeter?



No. Not even a reliable indication of charge level since as batteries age their internal resistance goes up as capacity drops. Not a huge drop in terminal voltage until right near the end. Dave Jones on the eevblog channel did heaps of videos on it when dealing with that scammy batterizer thing that was Kickstartered claiming to make batteries last longer.




Richard rich.ms

569 posts

Ultimate Geek
+1 received by user: 163

Subscriber

  Reply # 1845270 11-Aug-2017 15:30
Send private message quote this post

True, but you can determine the internal resistance by measuring current and voltage drop through a known load and therefore know if it's a weak battery though?


1527 posts

Uber Geek
+1 received by user: 232

Trusted

  Reply # 1846858 15-Aug-2017 09:03
Send private message quote this post

kryptonjohn:

 

True, but you can determine the internal resistance by measuring current and voltage drop through a known load and therefore know if it's a weak battery though?

 

 

I use the 10A range on a DMM, and just use the probes directly across the battery.

 

Only long enough for the reading to stabilise.

 

A fresh AA Alkaline (Varta) will read about 7.5A. When flat, and barely moves an analog clock, then it's around 0.8A.

 

Always use the same DMM, as readings will vary between DMM's.

 

 





My thoughts are no longer my own and is probably representative of our media-controlled government

569 posts

Ultimate Geek
+1 received by user: 163

Subscriber

  Reply # 1846875 15-Aug-2017 09:23
Send private message quote this post

Cheers Seppo, I'll try that. So at 1.6V (that's what some new alkalines I checked show) you can at least tell the DMM plus battery has only 0.2 ohm.


1527 posts

Uber Geek
+1 received by user: 232

Trusted

  Reply # 1846895 15-Aug-2017 09:42
Send private message quote this post

i should dig out my old analog VM, and see if the readings are similar.

 

DMM have such a high input impedance ( 1meg ohm upwards) ( load), that even a flat battery will still show 1.3-1.4v,, as there is no resistance to load the battery down.

 

Analog VM's have a lot lower impedance (20Kohm) that it should show a difference in the volts scale. But I doubt it.

 

Probably a better way would be a single cell batter holder, with a 10ohm resistor across the holder terminals, and then measure the voltage directly across the battery.

 

That will draw 150mA - a reasonable current to get a good voltage reading





My thoughts are no longer my own and is probably representative of our media-controlled government

1 | 2 
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Recognition for top small business advisors
Posted 22-Aug-2017 17:23


OPPO R11 dual 20MP camera phone debuts in New Zealand
Posted 22-Aug-2017 15:45


Intel introduces new 8th Generation processors
Posted 21-Aug-2017 19:02


Trend Micro launches Home Network Security
Posted 21-Aug-2017 18:38


Avondale College students at top of Microsoft Office Specialist World Championship
Posted 21-Aug-2017 14:11


Garmin introduces inReach SE+ and inReach Explorer+
Posted 21-Aug-2017 14:05


Public Wi-Fi plus cloud file sharing
Posted 18-Aug-2017 11:20


D-Link NZ launches professional Wireless AC Wave 2 Access Point for businesses
Posted 17-Aug-2017 19:25


Garmin introduces the Rino 700 five-watt two-way handheld radio
Posted 17-Aug-2017 19:04


Garmin announces the Foretrex 601 and Foretrex 701 Ballistic Edition for outdoor and tactical use
Posted 17-Aug-2017 19:02


Brightstar announces new distribution partnership with Samsung Knox platform in Australia
Posted 17-Aug-2017 17:07


Free gig-enabled WiFi network extends across Dunedin
Posted 17-Aug-2017 17:04


Samsung expands with connect Gear S3 Frontier
Posted 17-Aug-2017 15:55


Fact-checking Southern Cross Next cable is fastest to USA
Posted 17-Aug-2017 13:57


Thurrott says Microsoft Surface is dead last for reliability
Posted 16-Aug-2017 15:19



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.