Hi:
i hope that you can help me out. I need a battery pack for a dive cannister light.
The cannister measures 24.5 cm x 4 cm interior diameter dimension. The cannister has springs that compress approx 1 cm at each of the poles. So the length dimension varience is 22.5 cm to 24.5 cm length. I have an insert tube that can accommodate 25500 batteries, so we can narrow the width by using that tube, if necessary. However, I suspect that we will need all the diameter we can get.
I need a pack that be compatable with an LED array that can accept a maximum of 8.4 volts. So to be safe, I suppose the peak should be 8.0 volts and the operating voltage should be 7.5 volts; I welcome your recommendations there. I would like to get as much mAh as possible. And I would like to maintain operating voltage for as long as possible.
So I was thinking that the pack could have 18650 3.7 V high capacity, ideally 3000 mAh or better Li-On cells (such as the Trustfire 18560 3000 mAh cells), in 2S-4P (2 series, 4 parallel) Elephant II format, as recommended to me on this forum.
Anyway, what I want to end up with is the 7.5 operating voltage and as much mAh as I can possibly get, in a pack with button and flat cell pack ends (as in a consumer cylinder battery) to make contact with the springs). I would like 2 packs, with good protection circuitry. I also would need a charger.
FYI, it would be diffucult to convert the cannister from springs to leads, as one of the springs is difficult to reach. Please advise as to the best configuration, the cost per pack and the cost for a suitable charger and battery connections.
If you can't, do you know of a service that will. FYI, I am a consumer, not a manufacturer.
Thanks for your help.
jhcolman
i hope that you can help me out. I need a battery pack for a dive cannister light.
The cannister measures 24.5 cm x 4 cm interior diameter dimension. The cannister has springs that compress approx 1 cm at each of the poles. So the length dimension varience is 22.5 cm to 24.5 cm length. I have an insert tube that can accommodate 25500 batteries, so we can narrow the width by using that tube, if necessary. However, I suspect that we will need all the diameter we can get.
I need a pack that be compatable with an LED array that can accept a maximum of 8.4 volts. So to be safe, I suppose the peak should be 8.0 volts and the operating voltage should be 7.5 volts; I welcome your recommendations there. I would like to get as much mAh as possible. And I would like to maintain operating voltage for as long as possible.
So I was thinking that the pack could have 18650 3.7 V high capacity, ideally 3000 mAh or better Li-On cells (such as the Trustfire 18560 3000 mAh cells), in 2S-4P (2 series, 4 parallel) Elephant II format, as recommended to me on this forum.
Anyway, what I want to end up with is the 7.5 operating voltage and as much mAh as I can possibly get, in a pack with button and flat cell pack ends (as in a consumer cylinder battery) to make contact with the springs). I would like 2 packs, with good protection circuitry. I also would need a charger.
FYI, it would be diffucult to convert the cannister from springs to leads, as one of the springs is difficult to reach. Please advise as to the best configuration, the cost per pack and the cost for a suitable charger and battery connections.
If you can't, do you know of a service that will. FYI, I am a consumer, not a manufacturer.
Thanks for your help.
jhcolman
