DIY Battery Holders

Occasionally there is the need to charge a battery from a laptop, mobile phone or PMR handheld using an ordinary laboratory power supply. It could be that the charger is faulty or not available, or, as is often the case with mobile phones, the supplied adapter is not able to deliver enough current to ‘wake up’ a deeply discharged battery. If you want to charge a battery this way, you always have to proceed carefully and need to know what you can and can’t do with a particular type of battery.