The search for the USB rechargeable AA flashlight

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WalkIntoTheLight
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Lexel wrote:
there is a reason AA powered lights are not more than 1000 lumens per 4 batteries usually

Yes, but they could go higher in multi-emitter designs. Zebralight manages to get 500 lumens out of a single AA Eneloop. With 4xAA, and the higher voltage allowing for a more efficient circuit, 2000 lumens should be easy.

But probably not much more. Even Eneloops tend to cap out at about 5 amps. They can go more, but performance really starts to drop. So, 20-25 watts is probably as much as you can realistically get out of 4 Eneloops. Whereas, a single high-discharge 18650 can give at least 15 amps continuous, or over 50 watts.

I don’t think I’d want to discharge a single 18650 at 50 watts, but supposedly it’s safe according to Samsung. Shocked

DavidEF
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Lexel wrote:
there is a reason AA powered lights are not more than 1000 lumens per 4 batteries usually

Fair assessment.

So, if it weren’t for BLF, how many single 18650 lights would there be that produce over 1000 lumens?

My opinion – it would be the same number as 4xAA lights over 1000 lumens.

So, the reason, it seems to me is simply: Demand. We provide demand. The manufacturers then provide supply. Wink

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RollerBoySE
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WalkIntoTheLight wrote:
but supposedly it’s safe according to Samsung. Shocked

After Note 7, I somehow don’t trust Samsung when it comes to batteries… Sad

agent80
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The Note 7 fiasco had nothing to do with the batteries. It was due to bad design of the body.

RollerBoySE wrote:
WalkIntoTheLight wrote:
but supposedly it’s safe according to Samsung. Shocked

After Note 7, I somehow don’t trust Samsung when it comes to batteries… Sad

RollerBoySE
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agent80 wrote:
The Note 7 fiasco had nothing to do with the batteries. It was due to bad design of the body.
RollerBoySE wrote:
WalkIntoTheLight wrote:
but supposedly it’s safe according to Samsung. Shocked

After Note 7, I somehow don’t trust Samsung when it comes to batteries… Sad

Yeah, I know.
But a company that lets something like that slip through can’t really be trusted.
On the other hand: after this they probably will watch themselves.

samgalax
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I would be happy with a 2xaa nimh rechargeable via usb capable of about 350 lumens or more.

There is the niteye ec-a12… but expensive….

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LightRider
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Does anyone know of charger ic’s that support both 1.5 and 3.7v charging and with minimal external components? I am very close to a generic 16mm charger board for 3.7v. With the option of attached micro USB or wiring a remote socket. I would like to start on a design for aa if I can find a circuit to follow.

battery
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I remember seeing the Jetbeam SRA40 ages ago but that thing is almost 4 years old today. It cost a ton too.

DavidEF
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LightRider wrote:
Does anyone know of charger ic’s that support both 1.5 and 3.7v charging and with minimal external components? I am very close to a generic 16mm charger board for 3.7v. With the option of attached micro USB or wiring a remote socket. I would like to start on a design for aa if I can find a circuit to follow.

Maybe open up a multi-voltage capable charger and see what chip they use? I’d be interested in your design when you get it finished – if you’re sharing. Innocent

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Zorzi
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It seems this is a relatively old thread, but maybe it will help the OP. If you are ok with 1xAA flashlight, there is the Jetbeam E10R. It can recharge both 14500 and Ni-MH AA. The user interface is not the best, but it is a competent light anyway.

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