C & D Cell to AA Battery Adapter

I bought one of these to test in a LaCrosse BC-1000 AAA-AA charger. It works in all four bays. I will get another one because you could simultaneously put one in Bay 1 and one in Bay 4. I need to intelligently charge two kinds of C's: some 3 year old Tenergy Premium 5000 mAh NiMH's and some 10 year old Radio Shack 3000 mAh NiMH's. They had never been refreshed and had stopped charging correctly in my old 2 battery-per-bay dumb charger. The C size stub in the adapter bay works on the Tenergies but not on some of the Radio Shacks - too much plastic around the edge of the base of the negative side. No problem, just put the battery in the C to D converter shell that came with the BC-1000 and put it in the bay as a size D! (Or if you don't have a converter shell, just use some washers.)So far I put one Tenergy and one Radio Shack through a full Discharge-Refresh cycle. Each one took maybe 4 days. The Radio Shack got up to 2050 mAh and would not take any more: not bad. The Tenergy got up to 2150 mAh but started to charge further when I took it out and put it back in on the standard charge mode. It took another 1850 mAh, totalling 4000 mAh. Also not bad. I'm glad I didn't shell out for the big 8 bay Maha PowerEx C-D charger - I have a bunch of 9V Imedions (perfect in smoke detectors) and a couple of PowerEx chargers and I can attest that all their products are excellent, but if you only need to charge a couple of C's a month and don't care if it takes days, then these adapters are the way to go.

Fits on the BT-2400 charger perfectly. Works just as expected. I recommend this product.

Total waste of money. I was surprised by how sloppy the fit is given they're supposed to be made for the charger. Saying they're Poorly made is being kind. They don't sit well or charge well. Save your money and buy a charger that accepts the larger batteries.

I had initially wrote a bad review on this because during the discharge phase of my Maha C9000 every little bump would cause a different voltage and it's not because of the charger or the adapter but the batteries themselves..which are 2 D Sunlabz, http://www.amazon.com/SunLabz%C2%AE-Rechargeable-Batteries-Performance-10000mAhInsight from NLee the Engineer's comment in response to my issue at hand,"- The voltage reading during Discharge stage is always lower, due to the I*R drop from battery internal resistance and charger contact resistance.- The voltage reading during C9000's Impedance Check stage is always higher, due to I*R drop when current is flowing in the opposite direction.- The voltage reading from your multimeter is the open-terminal (no-load) voltage of the battery."I was reading the discharge voltage off my multimeter and i got a different reading from my multimeter than what the charger was showing. It also shows that the voltage reading was the open-terminal (no load/resting) voltage of the cell and not from the charger discharging the battery which i found to be quite interesting that there would be two different readings. I suppose the easiest way to explain it is from far enough away from a person who is hurt doesn't appear to be hurt, and you couldn't tell unless you were right there. Taking a reading from a battery from your multimeter when the charger is discharging is not always accurate and since i never used a NiMH D cell the high IR which was originally 17.2 volts according to my charger must be a larger difference to a D cell battery, plus the high discharge rate at 1A may be too much for the cells to handle.I have noticed this problem before on high IR cells where the flashlight would be so dim that it appears the cells are dead but when i pull the cells out they read at 1.26v or something like it instead of say, 1.1 volts. Anyway my original review stated that these adapters did not fit well in my C9000 and that there was a loose enough connection to where i wasn't getting a good discharging connection, but it appears that the connection is fine.. but the poor IR, or discharging capability of the batteries caused the low voltage when discharging the cells. My suggestion is put this charger in a place where it won't get knocked around and let it do it's thing. The other suggestion is try to cycle the battery a few times and see if that lowers the IR if you happen to have a battery that has a 10,000mAh capacity and trying to break in a 10A battery may not be as easy as you think. The other suggestion is to lower the capacity to say 9,000mAh and possibly lower than that and to not bump the charger at all.Still the connection can be iffy and the best thing to do is to leave the charger alone. Do all your adjustments either during the charging stage or when you put the battery in. Don't fiddle around with it and you'll be ok, if you have other batteries charging in the 2 and 3 slots.. either take them out or leave them in so you can do the D cells without interruptions. It's not that easy to get the charger to continue discharging the cells without the adapter being moved around causing the charger to prematurely end the discharge stage and it's not easy to restart it when the cells are too weak to handle.

All the pictures show 2 adapters, all the reviews talk about 2 adapters. Be advised you only get ONE(1) adapter!

Works great when trying to charge my d cell rechargeable batteries I use in a mag light. I have two battery chargers. The Maha c9000 and the bt-c3400. The 9000 has fixed locations for AA and AAA batteries and these adapters work great in the AA slot. Very stable. The 3400 uses a spring loaded terminal to allow it to charge multiple sizes of batteries and this adapted does not stay in that charger well. You can get it to work, but if the charger gets bumped it could lose connection and your charging process is messed up to some degree.

I bought one of these adapters to charge up a few C cell rechargebles that I had around the house and this item works great. I am using the newest version of the Opus BT-C3400 .. This combination is just unbeatable for charging and refreshing your rechargeable batteries.

Well it works. What can you really say about it? Honestly I bought it to test out in the Panasonic BQ-CC17KSBA eneloop charger, and it works fairly well. I can't say how it works in the intended charger, but at least in the Panasonic it does have some room to swing, which isn't much a problem, just something to point out. It also obscures the charging light, but since it's a smart charger I'll let it ride.