Fault with 18v charger or battery

One cell in battery found faulty and changed, but still will not charge and charger now appears to have fault on it. Not sure how to check, have tried testing at outlet terminals for voltage with multimeter and cannot find a voltage reading. Can you assist? I hate this throw away society regards

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I have this problem with an 18 V Li-ion battery pack on an AEG power drill, in fact out of two 2 A/h batteries and two of the 3 A/h, only one of the latter still charges.

I've been considering opening up such a pack and just checking the individual cells and replacing them if necessary.... Is that safe?

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Lithium battery packs and their chargers are rather fickle.

Almost all multiple cell battery packs have built-in electronics that check the state of the battery and might inhibit charging if they sense something wrong. The reasons is that charging a damaged battery may result in Bad Things Happening, i.e. fire or explosions.

Back in the days of NiCd battery packs replacement of a single dead cell might have been acceptable as a stop gap measure, but those battery packs were simple compared to their modern LiIon cousins.

My considered opinion would be, replace the battery pack, scavenge the good cells from the old pack and keep them for non critical single cell applications e.g. powering LED flashlights.

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