We often hear that you should not recharge normal disposable batteries. However, as far as I can tell so far, it can be done! Before you even attempt to do this, do an internet search on the dangers of recharging disposable batteries.
Recharging Disposable Batteries
As I was searching YouTube the other day, I came across a video of somebody showing how to charge disposable batteries. With the high cost of buying batteries, I figured that this may be a neat money saving trick.
Here is a copy of the video that I was watching:
How to charge ordinary Non-Chargeable batteries
So having watched the video and also reading up on other sites I decided to do my own experiment. So off I trotted to good old trusty eBay and purchased a LLoytron Universal Battery Charger that did the following batteries; AA AAA C D PP3 9V. I specifically chose this one as it also did the 9V batteries.
At this stage I decided not to purchase a mechanical timer, as I felt that it would be a waste of time if the charger did not charge normal batteries.
Disposable Battery Charging Experiment
A couple of days after my battery charger purchase it arrived in the post. I then set about to experiment with charging my batteries. It was very easy to find some old discharged disposable batteries, as these days you are given a bag to recycle old batteries. In our bag I found that we had 29 batteries awaiting disposal.
The first thing I did was to test all of the batteries with a multi tester that showed me how much power was left in each battery. As I tested them, I found that they all had less than 1.5 volts or 9 volts.
I then followed the instructions that came with my battery charger and loaded it up with my old run-down batteries. I turned the charger on, and felt good to see the two red led lights showing that it was charging.
Because of all the information that I had seen about the dangers of charging disposable batteries, I chose to have the charge at my desk so that I could check on it regularly.
During the course of the day I kept thinking that the batteries would heat up and explode, or at least leak and leave me with a snotty mess and wreck my battery charger. Well, there was nothing of the sort; the batteries did feel mildly warm as touched them on a regular basis. There was certainly no heat, leaks or explosions! (I am not saying that there never will be, but after charging all 29 nothing happened).
Every few hours I would stop the charging and test the batteries to see if they were accepting a charge, and they were. I would stop charging as each battery reached the 1.5 volt or 9 Volt level.
Out of all 29 batteries that I charged, three did not accept a charge, two 1.5 volt batteries and one 9 volt battery. Why I do not know, but they were put back in the recycling bag.
Most of these batteries are now waiting to be used, but some are in use and doing well!
I am not sure how often they can be charged, but I am sure that I will come back here and let you know. So for me the charging of disposable batteries has been a success and is now starting to save me money!