Sigma Mirage EVO and 2 cell LiIon battery?

[pe2er]

I Got a Sigma Mirage EVO - just the head, no battery.

The light is intended to be used with a 5 cell NiCd battery (6VDC nominal).

I Have hooked it up to a 2 cell LiIon battery (7.4 VDC nominal), so it is slightly overvolted. I Looked inside, and found a capacitor on the PCB that has a rating of 16VDC max, so no problems there. IC Was not identifiable (just a dark blob on the PCB). It seems to work just fine:

Just the battery indicator LED is off until the voltage gets close to 6V - then it illuminates Green.

Question is: Will it survive prolonged operation at 7.4V Volt (8.4 Volt just after recharging). Any experience?

 

[I Know Nothing]

No idea to your question from an electronics point of view but I have an older version of the Mirage with SLA battery & 5W halogen bulb that's been in winter commuting and night time mountain biking use since about 2002 I think and the battery has only just died after many overcharges, everything else still going no probs so I think they put together tough stuff generally.

As regards to the battery indicator, on mine it only comes on green to indicate low battery capacity rather than green to indicate on. Odd maybe but that's how it's designed.

 

[Szemhazai]

pe2er, it will survive... or not :huh:

Old 10W works fine but the new 5W burned after first time

 

[pe2er]

... battery indicator, on mine it only comes on green to indicate low battery capacity rather than green to indicate on. Odd maybe but that's how it's designed.

Thanks, it is reassuring to know that it is normal system behavior

...so I think they put together tough stuff generally.

Yes, they do. This unit was 3 years old when it died. The previous owner send it in for warranty and got it back with some parts replaced but still not functional. He then received a replacement unit and kindly gave me the old one. It turned out the small switch on the PCB had failed. So now it works again. I just had to assemble a battery pack for it

Have been thinking about converting it to LED, but it has a plastic housing and the reflector probably won't work well with a LED

pe2er, it will survive... or not :huh:

Old 10W works fine but the new 5W burned after first time

Yes, I guess I will find out. just wait until the snow clears off the streets

 

[pe2er]

So far, so good

Runtime of the light is approximately 1 hour for 2 LiIon cells. So far, it has survived 2 battery-charges

Light output is relatively low. Too low for my taste (must be my age )