Surefire B90 help
- Thread starter surebuilt
- Start date
The X80 runs at 3.6v so you'd need more than a CR123 can put out alone but less than 6v from 2 of them.
I have some NiMH battery packs built from B90s if you want to replace the originals PM me, you'll need a NiMH Hobby charger since the old B90 charger won't work, unless yours can be switched over.
I have some NiMH battery packs built from B90s if you want to replace the originals PM me, you'll need a NiMH Hobby charger since the old B90 charger won't work, unless yours can be switched over.
actual capacity for Sub-Cs is something like 4500 mA, right?
purchase a 7.2 V racing pack, one that is made from 2 rows of Sub-C cells.
cut them in half and build Yourself a powerful Ni-Mh "stick"
(if possible try to check, if the cells are already mounted together, or if they simply are connected by metal connectors. If the latter, You have to somehow "fix" the cells. Usually I use some glue and then shrinking tube)
(noone understands why SF does not upgrade from their 2500 mAh Ni-Cads. Makes 8X and 9N (imho their best rechargeable halogens) pretty useless)
purchase a 7.2 V racing pack, one that is made from 2 rows of Sub-C cells.
cut them in half and build Yourself a powerful Ni-Mh "stick"
(if possible try to check, if the cells are already mounted together, or if they simply are connected by metal connectors. If the latter, You have to somehow "fix" the cells. Usually I use some glue and then shrinking tube)
(noone understands why SF does not upgrade from their 2500 mAh Ni-Cads. Makes 8X and 9N (imho their best rechargeable halogens) pretty useless)
You should check your charger to see if it can charge a NiMH, mine has the ability but no switch. Check this thread and then open the back of your charger to see if it will work for you.
http://www.candlepowerforums.com/vb/showthread.php?t=186640
You may find that some Sub-C cells are longer than others this makes it hard to fit them in the charger. CheapBatterypacks.com 3300 cells were shorter than the NiCd Surefire cells and Tenergy Propel 4500 were 1/2mm longer but had badly over estimated capacity.
http://www.candlepowerforums.com/vb/showthread.php?t=186640
You may find that some Sub-C cells are longer than others this makes it hard to fit them in the charger. CheapBatterypacks.com 3300 cells were shorter than the NiCd Surefire cells and Tenergy Propel 4500 were 1/2mm longer but had badly over estimated capacity.
sure, the charger should be changed,
but - be honest - Ni-Mh and Ni-Cad are this "similar" in reality, that there is pretty no difference between them.
Its the same as to modding older white led with new ones: slight differences in vf, but noone cares for that
in a perfect setup, the batteries were tested and the end voltage set to a value suitable to them.
Ni-Cads can be 1.485-1.520 V, Ni-Mh are around 1.5 V end voltage per cell when charging. For me thats the same. Also check charging current, calculate runtime, add a bit and disconnect when not stopping. Some care should be taken with any charger.
This is not NASA, this is just us.
If the cells eventually loose 5 % of their lifetime, who cares?
:)
but - be honest - Ni-Mh and Ni-Cad are this "similar" in reality, that there is pretty no difference between them.
Its the same as to modding older white led with new ones: slight differences in vf, but noone cares for that
in a perfect setup, the batteries were tested and the end voltage set to a value suitable to them.
Ni-Cads can be 1.485-1.520 V, Ni-Mh are around 1.5 V end voltage per cell when charging. For me thats the same. Also check charging current, calculate runtime, add a bit and disconnect when not stopping. Some care should be taken with any charger.
This is not NASA, this is just us.
If the cells eventually loose 5 % of their lifetime, who cares?
:)
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LittleJoseph
Newly Enlightened
nein166
Is there a specific racing pack which you folks would recommend? I have viewed at www.gpbatteries.com/pic/370SCHR -- ZRS5037 rev1.pdf the GP370SCHR pack. What are your thoughts? Based on the data sheet, it appears to me the pack could be split and should/may fit the 8NX and Surefire Updated charger. I've been spending hours on this site reading, reading, reading and probably getting more confused than when I first started????:confused:
Have a GREAT Day!
Steve
"The difference between a successful person & others is not a lack of strength, not a lack of knowledge, but rather a lack of will."
Vince Lombardi
Is there a specific racing pack which you folks would recommend? I have viewed at www.gpbatteries.com/pic/370SCHR -- ZRS5037 rev1.pdf the GP370SCHR pack. What are your thoughts? Based on the data sheet, it appears to me the pack could be split and should/may fit the 8NX and Surefire Updated charger. I've been spending hours on this site reading, reading, reading and probably getting more confused than when I first started????:confused:
Have a GREAT Day!
Steve
"The difference between a successful person & others is not a lack of strength, not a lack of knowledge, but rather a lack of will."
Vince Lombardi
I don't see any pack in that PDF but the cell could be used to rebuild a B90 if you get three of them. You'd have a longer runtime as long as you have a NiMH charger.
LittleJoseph
Newly Enlightened
nein166,
Sorry, I inserted the wrong link. Here is the correct one: http://www.integy.com/st_prod.html?p_prodid=3762&p_catid=81
Base on the published measurements of the pack, I'm assuming three individual cells or a halfpack should reasonably fit into the 8NX and also in the SF Charger (upgraded version). One unknown is - are the three cells soldered or welded together OR is it the pack molding holding them together??? I have some 1" adhesive shrink tubing, 3:1 shrink ratio, and will make an initial attempt with half of a single pack. Still trying to locate some old B90s for parts, i.e. the negative connector ring piece, instead of making this part myself. Looked at a photo in a post by yellow on 01-28-2009, 11:52 AM, in thread titled "Surefire B90 rechargable?" I believe that is the only part I'll need to acquire.
Hope you enjoyed your weekend!
Steve
Sorry, I inserted the wrong link. Here is the correct one: http://www.integy.com/st_prod.html?p_prodid=3762&p_catid=81
Base on the published measurements of the pack, I'm assuming three individual cells or a halfpack should reasonably fit into the 8NX and also in the SF Charger (upgraded version). One unknown is - are the three cells soldered or welded together OR is it the pack molding holding them together??? I have some 1" adhesive shrink tubing, 3:1 shrink ratio, and will make an initial attempt with half of a single pack. Still trying to locate some old B90s for parts, i.e. the negative connector ring piece, instead of making this part myself. Looked at a photo in a post by yellow on 01-28-2009, 11:52 AM, in thread titled "Surefire B90 rechargable?" I believe that is the only part I'll need to acquire.
Hope you enjoyed your weekend!
Steve
From my experience all these cells differ in length. The button top cells are too long to fit the SF charger.
LittleJoseph
I have some extra B90's I rebuilt that are not being used that I'll sell you if your interested send me a PM
LittleJoseph
I have some extra B90's I rebuilt that are not being used that I'll sell you if your interested send me a PM
