The infamous charging issue with the #990. Truthfully, I stopped charging the CAB2 in the #990, even though I did get the charging circuit fixed. It still gets the CAB2 pretty warm, way warmer than I feel is good for the batteries. However, if I charge them in the #993 charging base, they charge properly every time, and when I take the remote out, it's stone cold, no overheating. I picked up two #993 charging bases on eBay a few years back cheap, that's what I use.