The fault occurred with a GP Powerbank GPKB01BS NiMH battery charger that came as part of a package with a digital camera. As it was only a few weeks old, I should have returned it under warranty. The purchase had been made at a Lidl store however. These have batches of stock week by week rather than continuous stock lines, which means that the store would have been unable to exchange the product. I didn't want to be without the camera while the package was returned to the manufacturer just for the sake of a faulty charger, so I decided to attempt repair. As repairs go, the charger is not a high-profit margin item. At the time of writing Argos has a similar item on special offer at about £25. These chargers do seem to have rather fragile series-regulator transistors in the current-limiting circuit however. Once you have the circuit diagram in front of you, fault diagnosis and repair can be carried out in minutes.
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