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Scuba Forum / UK Scuba / August 2006UK Light Canon 100
I have been using one of theses torches for some time now but with ordinary batteries. Can any one recommend a good rechargeable battery to use with this torch. I have been looking at Ansman NiMH 1,2V C 4500 mAh. Theses are expensive but look to be a good rechargeable battery. I have tried a few makes but find the light is not as bright with many makes. Cheers > I have been using one of theses torches for some time now but with ordinary > batteries. Can any one recommend a good rechargeable battery to use with > this torch. I have been looking at Ansman NiMH 1,2V C 4500 mAh. Theses > are expensive but look to be a good rechargeable battery. I have tried a > few makes but find the light is not as bright with many makes. Barry, I believe you'll find rechargeable batteries have lower voltage (1.2v) than disposable batteries (1.5v), hence, the bulb will be less bright with rechargeables. HTH. Dave C > I have been using one of theses torches for some time now but with ordinary > batteries. Can any one recommend a good rechargeable battery to use with [quoted text clipped - 3 lines] > > Cheers Do I understand that you are thinking about rechargeables to go in the hopper for disposable batteries? What about the battery designed and made for the light cannon (which is a single cell) - i've got one and its great - life and brightness (although I havent tried the torch with normnal batteries as per the other poster who said nicads gave lower brightness) > Do I understand that you are thinking about rechargeables to go in the > hopper for disposable batteries? > What about the battery designed and made for the light cannon (which is > a single cell) - i've got one and its great - life and brightness > (although I havent tried the torch with normnal batteries as per the > other poster who said nicads gave lower brightness) Sharky... its not a single cell. Its a battery pack made of NiCd cells. Its just packaged that way; inside, there are 8 D-cells. Rechargeables have lower voltage, yes, but with HID lights, the voltage isin't applied directly to the bulb. Besides, the 1.2V per cell is the nominal voltage. When fully charged, the cells will have slightly higher potential. For Sanyo cells, 1.3-1.4V, and they stay above 1.2 until almost empty (ref: www.sanyo.com). >> I have been using one of theses torches for some time now but with >> ordinary batteries. Can any one recommend a good rechargeable battery [quoted text clipped - 11 lines] > (although I havent tried the torch with normnal batteries as per the > other poster who said nicads gave lower brightness) The battery made for the Cannon probably contains more actual cells. Typically 5 or 10 rechargeable cells are used in place of 4 or 8 disposables to give the same voltage. Also, when going to NiMh cells you can use a higher wattage bulb than with disposables because rechargeables work better at higher currents. > Also, when going to NiMh cells you can use a higher wattage bulb than > with disposables because rechargeables work better at higher currents. To a point, especially with NiMH chemistry. Recommended load for NiMH cell is in the range 0.2-0.5C. Go beyond that, and you overdrain the cell lowering the voltage rapidly. NiCd are more robust in that matter, and hence also more popular in power tools which require high currents. Then you need to remember, than unlike non-rechargeable batteries, both NiCd and NiMH suffer a rather high self-discharge rate (around 2% daily IIRC). So charging your light a week ahead of the dive will leave it a bit emptish. >> Also, when going to NiMh cells you can use a higher wattage bulb than >> with disposables because rechargeables work better at higher currents. [quoted text clipped - 10 lines] > daily IIRC). So charging your light a week ahead of the dive will leave > it a bit emptish. I've never found that! I only use my torch about once a month and only charge it about every four or five outings (ie four months or so) and have never found it even close to flat. >> Then you need to remember, than unlike non-rechargeable batteries, >> both NiCd and NiMH suffer a rather high self-discharge rate (around 2% [quoted text clipped - 5 lines] > four or five outings (ie four months or so) and have never found it even > close to flat. 35W halogen with 4Ah NiMH cells, the difference in 4C water is slightly noticable after a prolonged break after charge. >> Also, when going to NiMh cells you can use a higher wattage bulb than >>with disposables because rechargeables work better at higher currents. > > To a point, especially with NiMH chemistry. I understand that NiMH off gas hydrogen when discharged heavily and should only be used with a platinum mesh catalyst in the air tight container or flush the container with an inert gas to prevent explosion caused by a spark. For the life of me I can't remember where I read that though.  SignatureMick Whittingham 'and I will make it a felony to drink small beer.' William Shakespeare, Henry VI part 2. |
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