Posted: 2/3/2010 12:32:29 PM EDT
| Does anyone make them? |
|
Why? I use AccuEvolution Ds in my 4D Maglite with the 3 Watt LED conversion. Even with daily use, the first charge lasted 8 months! Those are 10,000 mA-hour cells with very low self discharge. But they take hours to charge. I also have 5 cell 1500 mA-hour NiCd packs I made from sub-c cells. I use a piece of 1" PVC pipe as a shim along with a 1/2 spacer cell "dummy" to make up the length. This is a true 6 volt pack that will charge in under an hour on a proper rapid charger. |
|
Quoted: No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. There are several dual purpose flashlights with Cree LED emitters that use either a standard AA or AAA 1.5v or a Lithium 3.7v battery. I have one on my keychain right now. Here's a link to some: Flashlight http://www.dealextreme.com/details.dx/sku.26988 Battery http://www.dealextreme.com/details.dx/sku.974 These things are smoking bright, and have pretty decent run times also. My little single 10440 AAA size light puts out about 100 Lumens. It gets about 40% of that on Alkaline AAA's. |
|
saft one use
expensive http://www.hdssystems.com/?id=LithiumDSo2Battery only lithium disposable d cell i know of |
|
Oops, on the flashlight thing. Found this though: http://kaidomain.com/ProductDetails.aspx?ProductId=2708 |
|
Quoted: Quoted: No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. There are several dual purpose flashlights with Cree LED emitters that use either a standard AA or AAA 1.5v or a Lithium 3.7v battery. I have one on my keychain right now. Here's a link to some: Flashlight http://www.dealextreme.com/details.dx/sku.26988 Battery http://www.dealextreme.com/details.dx/sku.974 These things are smoking bright, and have pretty decent run times also. My little single 10440 AAA size light puts out about 100 Lumens. It gets about 40% of that on Alkaline AAA's. Show me a D cell light with the driver circuitry to take them both. |
|
Wouldn't waste my cash on those. |
|
Quoted:
Quoted:
Quoted:
No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. There are several dual purpose flashlights with Cree LED emitters that use either a standard AA or AAA 1.5v or a Lithium 3.7v battery. I have one on my keychain right now. Here's a link to some: Flashlight http://www.dealextreme.com/details.dx/sku.26988 Battery http://www.dealextreme.com/details.dx/sku.974 These things are smoking bright, and have pretty decent run times also. My little single 10440 AAA size light puts out about 100 Lumens. It gets about 40% of that on Alkaline AAA's. Show me a D cell light with the driver circuitry to take them both. http://www.batteryjunction.com/tle-300m-ex.html 6-24v next? |
|
Quoted:
Wouldn't waste my cash on those. didnt say they were good... |
|
Quoted:
No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. Then how do lithium AAs work in consumer electronics? 
The reason is probably twofold: One, cost. Nobody is going to buy a $30 pair of non-rechargeable D cells, except the military. And they already have disposable, long-life lithium cells for things that need them. Second, standard batteries like D cells are generally abused by the public, and D cells would have enough lithium to make the result of abuse an order of magnitude worse than AAs. I've noticed that even without any harsh treatment, just the pressure from the spring in my MagLights will deform D cells over time, compressing the positive terminal a little bit. And that's just letting them sit in the light. Know why laptop batteries top out at about 100 watt-hours? Because if they have more than twenty-five grams of lithium, the FAA won't let them on a plane because of the severity of the fire if one goes up. A maglight (or other device) with 6 or 8 lithium D-cells would have significantly more than that. Battery manufacturers probably don't want to take on the liability for the very low number of units they would sell. Worst-case scenrio - baby swing with 4 D cells, left on. If the battery protection doesn't work, that's an awfully big lawsuit. In the same paper from the FAA, notice that "consumer-sized" batteries can only have up to 2 grams of lithium each. A D cell would probably exceed that, so any made would automatically be excluded from planes. Given how few they would sell, even a small reduction in marketability could make them financially non-viable. |
|
Quoted:
Quoted:
Quoted:
Quoted:
No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. There are several dual purpose flashlights with Cree LED emitters that use either a standard AA or AAA 1.5v or a Lithium 3.7v battery. I have one on my keychain right now. Here's a link to some: Flashlight http://www.dealextreme.com/details.dx/sku.26988 Battery http://www.dealextreme.com/details.dx/sku.974 These things are smoking bright, and have pretty decent run times also. My little single 10440 AAA size light puts out about 100 Lumens. It gets about 40% of that on Alkaline AAA's. Show me a D cell light with the driver circuitry to take them both. http://www.batteryjunction.com/tle-300m-ex.html 6-24v next? Yep, you can also put a 4-5-6 malkoff in a 2D maglite and run 3.7-4.2V cells ETA: and if the OP is talking primaries, it could possibly be the same Voltage |
|
Quoted:
Why? I use AccuEvolution Ds in my 4D Maglite with the 3 Watt LED conversion. Even with daily use, the first charge lasted 8 months! Those are 10,000 mA-hour cells with very low self discharge. But they take hours to charge. I also have 5 cell 1500 mA-hour NiCd packs I made from sub-c cells. I use a piece of 1" PVC pipe as a shim along with a 1/2 spacer cell "dummy" to make up the length. This is a true 6 volt pack that will charge in under an hour on a proper rapid charger. If those 10 A-hour batteries are 1.5 V, that means they have 54 kJ of energy (or 39,800 ft-lbs) stored in each cell! 
No wonder they take hours to charge. |
|
Quoted:
Quoted:
Why? I use AccuEvolution Ds in my 4D Maglite with the 3 Watt LED conversion. Even with daily use, the first charge lasted 8 months! Those are 10,000 mA-hour cells with very low self discharge. But they take hours to charge. I also have 5 cell 1500 mA-hour NiCd packs I made from sub-c cells. I use a piece of 1" PVC pipe as a shim along with a 1/2 spacer cell "dummy" to make up the length. This is a true 6 volt pack that will charge in under an hour on a proper rapid charger. If those 10 A-hour batteries are 1.5 V, that means they have 54 kJ of energy (or 39,800 ft-lbs) stored in each cell!
No wonder they take hours to charge. 1.2v, so 31,862.6848 ft-lbs, but you wouldnt get that much out of them |
|
Quoted: Peukert's Law. At 2 amperes, voltage stays above 1.25 per cell for 3 hours. That is a usable capacity of 6 A-hours. Bump discharge up to 10 amperes and they drop below 1.25 volts per cell in less than a half hour, making them under 5 A-hour capacity. But in my flashlight? The draw is 600 mA at 5.25 voltsQuoted: Quoted: Why? I use AccuEvolution Ds in my 4D Maglite with the 3 Watt LED conversion. Even with daily use, the first charge lasted 8 months! Those are 10,000 mA-hour cells with very low self discharge. But they take hours to charge. I also have 5 cell 1500 mA-hour NiCd packs I made from sub-c cells. I use a piece of 1" PVC pipe as a shim along with a 1/2 spacer cell "dummy" to make up the length. This is a true 6 volt pack that will charge in under an hour on a proper rapid charger. If those 10 A-hour batteries are 1.5 V, that means they have 54 kJ of energy (or 39,800 ft-lbs) stored in each cell! No wonder they take hours to charge. 1.2v, so 31,862.6848 ft-lbs, but you wouldnt get that much out of them |
|
Quoted: A drop-in here, a mod there. Still not a market.Quoted: Quoted: Quoted: No point to it because they wouldn't work in existing electronics. 3.0v or 3.7v in something designed to take 1.2v batteries? Not gonna work. What we need is more NiMH rechargeable options. There are several dual purpose flashlights with Cree LED emitters that use either a standard AA or AAA 1.5v or a Lithium 3.7v battery. I have one on my keychain right now. Here's a link to some: Flashlight http://www.dealextreme.com/details.dx/sku.26988 Battery http://www.dealextreme.com/details.dx/sku.974 These things are smoking bright, and have pretty decent run times also. My little single 10440 AAA size light puts out about 100 Lumens. It gets about 40% of that on Alkaline AAA's. Show me a D cell light with the driver circuitry to take them both. http://www.batteryjunction.com/tle-300m-ex.html 6-24v next? |