MODIFIED MOUSE RUNS ON LITHIUM ION CELL PHONE BATTERY

Step 4 Making contact

The terminals of the battery are somewhat recessed and my spring contacts had a hard time making contact so I built the terminals up with a little solder. My phone didn't care.

This requires hit-and-run soldering. You have to have the iron just the right temperature so you can get the solder on quickly and remove the iron before you melt the battery case.

SAFETY NOTE:  Lithium ion batteries are dangerous critters.  They don't take kindly to abuse. These batteries have a safety device built into them to prevent overcharging or over-current (short circuited) which ends up disabling the battery, but that's better than the alternative which the industry euphamistically calls "venting with flame".  When even the euphamism sounds scarey, you're dealing with some serious doo-doo.  Don't do anything to one of these batteries that can pierce it, overheat it, or otherwise tick it off.

Comments

[67spyder]

You are right these batteries need special care. Very important is to not let them fall below about 0.9V to be safe most devices won't let them drop below 2.5V. There is very little power between 2.5 and .9 V so there is no point going below 2.5. There is great info about these cells at http://batteryuniversity.com if you are going to undertake a project with LiIO batteries you should do some reading and possibly save burning your house down.

Having said that they are amazing cells and with a little care can really shine in a project like this.