Two things I wish I knew before I bought:

1) You have to unplug this charger at the wall socket every time you charge one or more batteries before you can charge another battery.

2) This charger is very large - approximately 9" x 4" and 2 1/2" tall.

The unplugging requirement ruined this product for us. I suppose if you are using it on a workbench with easy to reach electric socket, or charge a couple batteries and put it away every time, unplugging might be OK, but we keep our charger in the kitchen and the socket is behind the microwave - so very inconvenient. Other places we might keep a charger handy but out of sight have even less convenient wall sockets. We've been using AA and AAA rechargeable batteries for > 10 years so we seem to always have something to recharge. When I added C and 9V I bought this charger expecting it to replace our aging AA / AAA charger. Rather than being more convenient and flexible it is just aggravating to use.

This charger could have been a good product if they had simply put a reset button on the charger unit itself or a switch on the power cord near the unit. With need to unplug at wall socket after every charge, I regret purchasing this charger in spite of its versatility. Not worth sending back and I'm too cheap to replace it so it will aggravate us for years to come.

I purchased more Tenergy rechargeable D cells along with 9 volt batteries and needed a 9 volt charger so I bought a couple of the chargers based on the reviews that were posted here. I am completely satisfied with the chargers and you will be too.

Had for just over a year - no matter how many times I pugged it in after lights went out - I could only get a charge of 50% maybe. Now it has quit completely. Maybe I got a Lemon. Going to buy a new one and see what this one does.

It is a larger battery charger than I thought. It does the job! It is only for NiMH batteries. The charger helps of reducing waste. The charger also helps the savings account!

The batteries charge fast and easy.