Ping - SilverFox or anyone else who made B90 upgrade packs

[Beastmaster]

I have an interesting question.

It's somewhat related to my X80 LED Lamp assembly project.

Is there a way to increase the voltage of a B90 sized battery pack? Like using AW's C cells or something like that?

I'd love to see if there's a way to do a higher voltage battery pack so it can drive a Cree Q5 a bit better.

Thanks,
Steve

 

[depusm12]

You might be able to use 1/2 size sub C cells. IIRC the sub C cells are what are used in the B90 cells (3 to be exact). So you should be able to use 6 (1/2 sub C cells) for 7.4 voltage. But check with SilverFox first.

 

[SilverFox]

Hello Steve,

The length of the B90 is about the same as 2 18650 cells. That would give you 7.4 volts. You would have to make up for the difference in diameter, and figure out a way to charge it.

Tom

 

[depusm12]

Tom

What about my idea of using 1/2 Sub C cells would that work as well?

 

[Beastmaster]

Hello Steve,

The length of the B90 is about the same as 2 18650 cells. That would give you 7.4 volts. You would have to make up for the difference in diameter, and figure out a way to charge it.

Tom

Hmm.....7.4 volts and 2200mAh. That's close in mAh (well, the B90 has 1800mAh IIRC) to the original and more voltage that will run the module. Cool.

For me - charging it would be using the clamp method probably. I don't know for others.

Diameter - that's another good one.

But it is doable. Sweet.

Thanks,
Steve

 

[SilverFox]

Hello James,

Yes, your idea would also work. Once again you would have to come up with a way to charge the battery.

When I did my run of NiMh B90 replacement packs, I wanted to provide a better performing pack that was still compatible with the SureFire charger. So far it has worked out very well, and I am looking at doing another run.

If we through out charger compatibility, everything changes.

Tom

 

[Beastmaster]

Hello James,

Yes, your idea would also work. Once again you would have to come up with a way to charge the battery.

When I did my run of NiMh B90 replacement packs, I wanted to provide a better performing pack that was still compatible with the SureFire charger. So far it has worked out very well, and I am looking at doing another run.

If we through out charger compatibility, everything changes.

Tom

Well, here's the dilemma I'm facing.

With my prototype X80 LED lamp assembly, I'm seeing about 2x runtime, but about the same level of light and same throw, but slightly better flood. I had to pick a driver board that is optimized for the voltage range, which is ironically the same range as a 1x123 unit.

In order to get better performance, I need a better driver and therefore I need more voltage.

Hence why I posted. I don't even know if it's feasible to pursue it....since most drop in's don't require the upgrade of the batteries either.

-Steve

 

[NotRegulated]

Since we are talking outside the box...
how about a tube carrier that holds two 18650's and drops into the 8 series body?

 

[dano]

I made a 1/2 sub c pack for a Stinger that I was running a Super Stinger bulb.

5 1/2 sub-c's equate to 3 sub-c's in length.

-dan