Comments on: Homemade Cordless – Portable Phone Battery Pack

By: tmc

tmc — Sat, 22 May 2010 10:54:39 +0000

I’ve made battery packs for my uniden tru-8885 handsets.. I’ve just ordered more aaa batteries to make the 3rd handset pack. although 2 handsets is more than enough for right now, hehe..
When working with delecate parts & soldering it’s very easy to get burned. I wish a “aaa” pack would fit in the same space, that way you could just swap the batteries at will instead of soldering all the time– but they make the form factor of the phones to be very anti-battery pack… maybe it might fit if I can find a thin pack & scrape away most or all of that foam that locks in the pack to keep it from scrunching around.

By: sydney

sydney — Wed, 15 Jul 2009 02:51:10 +0000

Update: I finished making 2 battery packs. The last one I left the original plastic wrapper on the batteries, took 2 out and left the other 2 in, then duct tape 3 together which holds better, then cut holds at +/- ends of the plastic wrap.

By: sydney

sydney — Wed, 15 Jul 2009 01:28:30 +0000

I solder batteries for my panasonic shaver. I’m going to do it for my phone, but some ideas: I’m going to try duct tape 3 batteries together (though I have a glue gun). Also the source sells batteries holders but they may be too bulky. My idea is to make a replaceble battery holder so that the next time the new batteries die, I can replace them without too much work. The aluminium foil sounds good, but I would be very caution not to have hot wired batteries because burning a house down while you are away is not good.

By: Blathering1

Blathering1 — Wed, 27 May 2009 21:40:04 +0000

Soldering to a battery can overheat the battery, and I have had difficulty getting a good bond.

Without sourcing tabbed batteries– but using locally available rechargeable, what are options to attach a conductor between the battery terminals.
Someone mentioned ‘welding’. What is this in this small of space… and does it help the heat damage issue?

By: Upendraya

Upendraya — Thu, 21 May 2009 13:19:52 +0000

I don�t usually reply to posts but I will in this case. WoW

By: Jan

Jan — Fri, 10 Apr 2009 07:55:13 +0000

Hi Rob
Came across this website by chance and thought I should advice.Dont even know the country.I live in New Zealand.To answer your question; you can use any “mah” you like but you can not use a nimh rechargeable battery and have it charged by a charger dedicated for a nicad.
By the way, I make battery packs as a supplement income.Designed my own “micro welder” and a very clever friend did the electronics for me.
Nice talking to you!!

By: Rob

Rob — Fri, 10 Apr 2009 06:23:23 +0000

Jan, some great points you have there! If I were doing this again (I think this post is about 4 years old now) I’d use the tabbed batteries that come ready to be soldered and would use either NICD. Do you think it would be possible to use NIMH with a really high mA hour rating, especially given self discharge, etc?

By: Jan

Jan — Fri, 10 Apr 2009 05:33:30 +0000

P.S.

 A charger for nickel-metal-hydride can also accommodate nickel-cadmium, but not the other way around. A charger designed for nickel-cadmium would overcharge the nickel-metal-hydride battery.
You changed nicad for nimh which would mean that the charger was designed for nicad and not nimh ( oops)

By: Jan

Jan — Fri, 10 Apr 2009 05:28:09 +0000

I am sure that your DIY battery packs would do the trick but to solder a battery is not very clever as battery cells have delicate safety vents that can be damaged and your battery is not going to last very long or could be damaged beyond repair.Welding is the only way you should connect battery cells together.

By: Expandable cordless phone system

Expandable cordless phone system — Fri, 27 Feb 2009 22:32:15 +0000

I love anything to do with phones, whether its mobiles, cordless phones. I especially love the technology and weird stories. Good post, thanks.