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#1
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Cheap rechargable batteries
Those of us that can't afford the luxury of hub dynamos may be interested
in fairly decent rechargeable batteries at Lidl for the bargain price of £1.99 (that's less than normal batteries!): http://www.lidl.co.uk/gb/home.nsf/pa...ted_Rechargeab le_Batteries Ni-MH batteries (£1.99 a pack): - 9V battery, 200mAh - 4 x AAA, 800mAh - 4 x AA, 2,100mAh - 2 x C, 3,500mAh - 2 x D, 4,000mAh |
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#2
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Cheap rechargable batteries
Mark Thompson wrote:
Those of us that can't afford the luxury of hub dynamos may be interested in fairly decent rechargeable batteries at Lidl for the bargain price of £1.99 (that's less than normal batteries!): http://www.lidl.co.uk/gb/home.nsf/pa...ted_Rechargeab le_Batteries Ni-MH batteries (£1.99 a pack): - 9V battery, 200mAh - 4 x AAA, 800mAh - 4 x AA, 2,100mAh - 2 x C, 3,500mAh - 2 x D, 4,000mAh That's not a bad capacity for AA and it's an amazing capacity for D (if it's true). With 4 "D" cells you could run a 2.4W front lamp for a whole Dunwich Dynamo. |
#3
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Cheap rechargable batteries
Zog The Undeniable wrote:
That's not a bad capacity for AA and it's an amazing capacity for D (if it's true). With 4 "D" cells you could run a 2.4W front lamp for a whole Dunwich Dynamo. 4Ah is what you get from one of those moped batteries they supply with the Smart sets; (which should do 10h on 2.4W) have been looking to convert one lamp to 2.4v 2xD operation for night rides, will have to do a bench test with some alkalines first. |
#4
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Cheap rechargable batteries
"Zog The Undeniable" wrote in message
news:43da914b.0@entanet That's not a bad capacity for AA and it's an amazing capacity for D (if it's true). With 4 "D" cells you could run a 2.4W front lamp for a whole Dunwich Dynamo. Pfffft, that's pants. Check out http://www.strikalite.co.uk/prodcat_...Batteries.html Good ol' Rog at Strikalite assembled me a pack of 5 of these 9Ah beauties into a 3x2 'pyramid' which I added an automotive 5A fuse to, and enclosed in a small aluminium enclosure. The whole caboodle sits of the carrier stays on my Ultra Galaxy, and when charged using a Jamara charger (also at Stikalite, but pricy) the capacity is calculated at 10.5 Ah. It powers a pair of Cateye 10w fronts admirably, far better than the silly 2.2Ah sticks they came with, and about the same weight. I'll take a pic and upload it tomorrow. I have no connection to Strikalite, other than being a satisfied customer for the last 10 years or so... they fulfill all my battery requirements. Tim -- Sent from Birmingham, UK timdunne at blueyonder.co.uk 'God's electrician sparked up the heavens once again, heading northbound on the 7:10. And the lord said let there be commuters...' - Thea Gilmore Look, mum, an anorak on a bike! Check out www.nervouscyclist.org |
#5
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Cheap rechargable batteries
Tim Dunne wrote:
"Zog The Undeniable" wrote in message news:43da914b.0@entanet That's not a bad capacity for AA and it's an amazing capacity for D (if it's true). With 4 "D" cells you could run a 2.4W front lamp for a whole Dunwich Dynamo. Pfffft, that's pants. Check out http://www.strikalite.co.uk/prodcat_...Batteries.html Good ol' Rog at Strikalite assembled me a pack of 5 of these 9Ah beauties into a 3x2 'pyramid' which I added an automotive 5A fuse to, and enclosed in a small aluminium enclosure. The whole caboodle sits of the carrier stays on my Ultra Galaxy, and when charged using a Jamara charger (also at Stikalite, but pricy) the capacity is calculated at 10.5 Ah. It powers a pair of Cateye 10w fronts admirably, far better than the silly 2.2Ah sticks they came with, and about the same weight. I'll take a pic and upload it tomorrow. I have no connection to Strikalite, other than being a satisfied customer for the last 10 years or so... they fulfill all my battery requirements. What do they weigh? With six of them (7.2V) you could run a dynamo headlamp [1] all day and all night...depends on the trade-off between the lack of dynamo drag (say 5W for a Schmidt) and the extra weight you have to lug uphill, which could partially be offset by a lighter front hub than the Schmidt. [1] inevitably overvolted by a dynamo, so 5 batteries (6V) on a 3W 0.5A bulb doesn't give the brightness you'd expect. |
#6
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Cheap rechargable batteries
Zog The Undeniable wrote: Tim Dunne wrote: "Zog The Undeniable" wrote in message news:43da914b.0@entanet That's not a bad capacity for AA and it's an amazing capacity for D (if it's true). With 4 "D" cells you could run a 2.4W front lamp for a whole Dunwich Dynamo. Pfffft, that's pants. Check out http://www.strikalite.co.uk/prodcat_...Batteries.html Good ol' Rog at Strikalite assembled me a pack of 5 of these 9Ah beauties into a 3x2 'pyramid' which I added an automotive 5A fuse to, and enclosed in a small aluminium enclosure. The whole caboodle sits of the carrier stays on my Ultra Galaxy, and when charged using a Jamara charger (also at Stikalite, but pricy) the capacity is calculated at 10.5 Ah. It powers a pair of Cateye 10w fronts admirably, far better than the silly 2.2Ah sticks they came with, and about the same weight. I'll take a pic and upload it tomorrow. I have no connection to Strikalite, other than being a satisfied customer for the last 10 years or so... they fulfill all my battery requirements. What do they weigh? With six of them (7.2V) you could run a dynamo headlamp [1] all day and all night...depends on the trade-off between the lack of dynamo drag (say 5W for a Schmidt) and the extra weight you have to lug uphill, which could partially be offset by a lighter front hub than the Schmidt. [1] inevitably overvolted by a dynamo, so 5 batteries (6V) on a 3W 0.5A bulb doesn't give the brightness you'd expect. What type of batteries? ISTR that my nimh batteries I use for my LED lamps though rated at 1.2V seem to read more like 1.3V when fully charged. Maybe it's my meter. The brightness of the lamp will of of course drop over time, but I think 1.3x6 = 7.8V might well be stretching it a bit (I could be wrong of course). You'd probably want regulation to deal with this, but that might well reduce the effiiciency. AA nimh batteries I use are 2300mAh. At 500mA (3W bulb or 2.4+0.6 for front+rear) you're going to get a run time of 4.6 hours at nominal capacity, if I've done my sums right. At 1A (giving the dual lamp functionality of a SON) then you're 2.3 hours. Sufficient for commuting, I'd think. Not going to run all night though! Simon |
#7
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Cheap rechargable batteries
I see Maplin do a Li-Ion rechargable pack (meant for camcorders but
prolly adaptable) which is 2Ah, seems a good trade off between weight and capacity. |
#8
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Cheap rechargable batteries
"MartinM" wrote in message
oups.com I see Maplin do a Li-Ion rechargable pack (meant for camcorders but prolly adaptable) which is 2Ah, seems a good trade off between weight and capacity. Not a good idea - LiIon batteries have a tendency to explode if not handled and treated in accordance with guidelines - one thing they don't like is deep current draw and vibration. Tim -- Sent from Birmingham, UK timdunne at blueyonder.co.uk 'God's electrician sparked up the heavens once again, heading northbound on the 7:10. And the lord said let there be commuters...' - Thea Gilmore Look, mum, an anorak on a bike! Check out www.nervouscyclist.org |
#9
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Cheap rechargable batteries
On Sat, 28 Jan 2006 11:15:23 GMT, "Tim Dunne"
wrote: "MartinM" wrote in message roups.com I see Maplin do a Li-Ion rechargable pack (meant for camcorders but prolly adaptable) which is 2Ah, seems a good trade off between weight and capacity. Not a good idea - LiIon batteries have a tendency to explode if not handled and treated in accordance with guidelines - one thing they don't like is deep current draw and vibration. So the cycle mounts for mobile phones have something to deal with this, or do they all come with, your phone may explode warnings? Jim. |
#10
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Cheap rechargable batteries
Tim Dunne wrote: "MartinM" wrote in message oups.com I see Maplin do a Li-Ion rechargable pack (meant for camcorders but prolly adaptable) which is 2Ah, seems a good trade off between weight and capacity. Not a good idea - LiIon batteries have a tendency to explode if not handled and treated in accordance with guidelines - one thing they don't like is deep current draw and vibration. OK thanks. Out of interest does anyone know what the actaul capacity of the various alkaline D cells on the market is? (the are very secretive on their packaging). |
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