3 pin cell phone battery question - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 16th December 2006, 01:03 AM   #1
diyAudio Member
theAnonymous1's Avatar
Join Date: Feb 2004
Location: Anonymityville
Default 3 pin cell phone battery question

I have some cell phone batteries I plan on using with headphone amplifiers. These have 2 positive contacts, one goes straight to the battery and the other one is the output from the small circuit board.

My question is which one is for charging and which one if for the output?

I've searched the net for almost an hour now and can't seem to find any info.
  Reply With Quote
Old 16th December 2006, 01:08 AM   #2
diyAudio Member
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
Go straight to the battery if you can.
I always have issues with those battery "watchdog"/controller boards giving me grief.
  Reply With Quote
Old 17th December 2006, 03:48 AM   #3
jc2 is online now jc2
diyAudio Member
Join Date: Dec 2001
Location: Atlanta, Georgia
Unless you know what you are doing and know that you aren't going to do anything that creates an unsafe situation I wouldn't recommend bypassing the monitoring circuitry.

One three pin cell phone batteries you generally have ground, the positive battery voltage, and the 3rd is either some sort of serial communication, or more likely a thermistor connected to ground that is used for identification and as a temperature monitor.
  Reply With Quote
Old 21st December 2006, 04:47 AM   #4
diyAudio Member
TwoSpoons's Avatar
Join Date: Oct 2004
If those are Li-ion batteries, then DO NOT bypass the safety cutoff circuit! If discharged too far Li-ions can go into destructive self-discharge.

Have you considered after-market Ipod replacement batteries? They're way cheaper that cell phone batteries, and they have a nice wire with a plug on the end, instead of flat contacts.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Horn for Cell phone alexmoose Multi-Way 1 9th August 2008 10:20 PM
how does a cell phone get it right to transmit over 7km jacquesl Everything Else 18 8th December 2006 11:18 AM
Need to rig something to record cell phone... LMJ Everything Else 5 22nd September 2005 09:38 PM
Mobile/Cell Phone EMI Con Multi-Way 3 29th August 2004 12:21 PM

New To Site? Need Help?

All times are GMT. The time now is 10:07 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2