Returned. The instructions say that ERR is displayed when bad battery is inserted. I filled it with my NIMH battery and only recharged two. The rest shows an error. I tried more batteries and the same result. I had no problems with the other two Smart Chargers. I had a similar issue with another smart charger that was showing an error on almost all of my 20+ different battery brands. All these batteries can't be bad as they charge perfectly with my other two and work well.
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