I have a MHC9000 and will have a Opus BT-C3100 V2 soon. I want to charge NiMh C cells and maybe D cells.
I have seen various mention of adapters that plug into these chargers. None I have seen seem to be well thought of.
Can anyone recommend a good quality, reliable adapter?
An alternative I am not fond of would be to get something that looks like an AA (e.g., AAA adapter) that could go in the charger and I could solder wires on the inside of the adapters, and wire to external battery holders. If I can't find a good first choice solution, I would appreciate recommendations for the second solution.
I do not know the answer to that. I’d post up in either HKJ’s review thread or in the GB thread (not both) and see what people have to say. I ordered one but do not have it yet.
On the box it says there’s a 20 000 mAH charging capacity. I think D cells are rated at 10 000 each for the good ones so you can only charge two in that respect and also physical limitations. Guessing it just stops charging when it hits that and you may have to put the Ds back in.
The 20,000mAh capacity is certainly a per-cell capacity. So that would not be a problem.
A closer look at some images on Google shows that there’s just no way that you can fit more than two C-cells. Adapters will not help with this, although they will allow you to charge D-cells as well. Can you link to the bad reports on the adapters? Frankly the pictures of the adapters don’t have me all excited.
I personally doubt that you’ll find what you want (a 4*C to 4*18650 charge bay adapter), but I hope that you have good luck finding it anyway. I’d recommend that you look at some of the larger NiMH-only chargers.
I have not suggested 4 C or 4 D in a single charger using adapters.
Please re-read the OP. I want an adapter to make any combination (presumably 1 C or D per two slots). It would depend on construction. It would be unreasonable to expect a one for one adaption. That is not what I asked.
I want an adapter to allow a C or D to be charged in an AA slot. They exist. I have seen them. That is not the question. I am asking for a recommendation of a quality vendor. Nothing else.
OK. I will try to ask the question again but specify it more precisely.
In the following specification, the mention of C and D cells shall be treated as an optional selection of construction. There must be the capacity for C cells. Accommodation of D cells shall be viewed as optional and not an essential feature.
A device, consisting of a frame (probably plastic or a composite). On the bottom of the frame there shall be a male connection constructed such that two electrodes shall be in positive electrical contact with the two electrodes in a slot of a battery charger designed to accommodate four AA cells. Accommodation of two frames in a four slot AA charger is required. Designs shall be required to use the two outer charger slots for charging two of the larger cells. Allowing four larger cells with use of all four connections of the four slot charger will be considered an advantage. No larger cell shall share a contact set on the charger with another of the large cells.
The top of this frame shall contain a space appropriate for holding a C or D battery cell. The proper space may be supplied by separate frames for each battery size. A frame may also support both cell sizes in a single frame. This may be achieved in the same cell space or an additional space, likely to the side of the cell space of the different size. That would yield a frame with a side by side C and D charging space with appropriate parallel electrical connections, and underneath there would be a portion of the frame for insertion into a standard AA battery charger slot and contacting the electrical contacts necessary for charging.
The overall frame design and quantity must allow at least two C or D cells to be simultaneously connected to a individual slots of a four slot battery charge designed for AA charging. Each C or D cell must be connected to a separate charger slot's electrical connections. If only two frames and large batteries are accommodated, the slots in the charger used for this must be the outside pair of a four slot charger.
These devices exist. I have seen them. I am asking for a recommendation based on the quality of construction and electrical contacts.
Characteristics and management of the four slot charger is outside the scope of this request.
OK. Can someone please provide some experience based recommendations?
Jeez you’re a bit uptight mate. This is a free forum with members of varying knowledge and experience who are all trying to help. If we try but fail, don’t get all dyspeptic.
Asking for help on this forum is like doing a search on Google.
The search criteria should be specific enough that the search results will lead to to what you are looking for BUT vague enough so as not to eliminate other results that would be appropriate. By being too precise in your search, it is possible to exclude the very answer you are looking for. Same goes for your request. You have eliminated any possibility of a result because an adapter exactly as you describe does not exist.
You will probably need to flatten the knob on the positive terminal for the 2 that sit on the inside banks. They are not needed anyway and it will prevent the holders from wanting to pop out as they do no sit quite a low as the outside 2.
I’d say you are not aware of more than one design of adapter. I’d say there is only one design of adapter (that’s all I’ve seen, and you haven’t shown us anything else…), and it’s OEM’d under at least two different brand names (Opus & Powerfocus). Quality will be the same with both.
Links to the adapters you’ve seen already & links to the discussion of quality problems?
Thank you netjrb. That has to have been where I saw one. Somewhere I believe I have seen a white one. And that may have been the one with comments. But I could be wrong.
I have no idea where I read the comment about bad contacts. I have been thru hundreds of threads and posts on batteries, chargers, etc. in the past couple of weeks.
I just ordered a pair. For $10, if they work great. If not, I will not drink 2 beers to cover it. Unfortunately, I will probably then have to drink 3 beers to console myself for not having a solution yet.
dchomac - precisely what I was talking about just wired to some battery holders for the C and D. Nice work. I just prefer a compact solution if I can do it. Space to use for charging for long periods is scarce.
I have been unable to get search on this site so I have been reduced to reading every thread to find a mention or ask for help. I have been working with the sysadmin on the problem. It appears that if I use IE instead of FF it works.
For those objecting to my restatement - may you be doomed to read government purchase requests.
Maybe what you were remembering was HKJ’s review of the BT-C2000 where he mentions that internal resistance will be measured incorrectly with the adapters.
Sorry wight - I did not see your second link in your post. My eye broke about 1.5 weeks ago and I am having a real problem seeing detail. And it will be another couple of weeks before I can get laser time to try to fix it. I appreciate you help.
