If the BR35 appears not charging. please check the steps below.
1) Please make sure the supplied charging cable is fully plugged into the Micro USB port on the light.
2) The (solid part of the) charging indicator bar shows how fully the battery is. If the indicator bar keeps blinking, please consider using a high power (5V/2A) USB charging adapter. You can also connect the charging cable directly to a computer USB port. If the adapter does not provide enough power, let it slowly charge for a few hours. The indicator bars should become steady after a while.
This usually happens when 1) the battery is low and/or 2) the USB adapter is not providing enough power.
The unit draws the highest amount of charging current from the power adapter when its battery is at a low level. The OLED display and the blue power indicator might blink erratically at this stage. Once the battery level is half full or the charging stabilizes, the display will be back to normal. This does not impact the function or charging of the light.
Question: Why BR35 does not always display the runtime as shown in the specification. For instance, it displays 4 hr runtime for TURBO setting while the specification is 1 hour only.
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I talked with the engineers for long time today. Here are the information I gathered.
The Runtime reading is a real-time calculation result. (My guess is it is based on battery voltage output) It is mainly affected by two factors.
1. There is always a delay in readings whenever the modes are switched since it takes a while for the circuit to reapply and stabilize the voltage.
2. Now here is the confusing part. If you are familiar with the LED ouput vs time curve, it always looks like the one in the attachment. So when you turn on the light at 1800 lumens, its brightness will drop down after a while when the temperature arises. If you turn off/on the light or step down/up the brightness, it will go back to 1800 lumens. The specification of 1hr is how long the light can run at 1800 lumens if you keep bringing the brightness up. Of course this is not practical in real use. Therefore the BR35 calculates the runtime based on the curve instead of the peak value. The industrial standard is to benchmark the time between the peak to a certain percentage (maybe 30%?) which I am not very sure.
3. Here is the even more confusing part. At different brightness, the runtime curve is different. At 500 lumens or below, the brightness rarely changes until the battery is almost out while at high brightness the slope is more obvious. This further complicates the calculation. For instance, if you alternate the two LEDs at low setting, you can see the runtime double/halves. If you do the same at high settings, the change won't be that obvious.
I wish I could provide a better explanation. And I wish the factory implemented a more friendly user display. Right now it is a direct translation of the measurement result instead of an intuitive one. I have already passed your feedback to them and hopefully they can make improvement in future versions.
Feel free to contact us if you have any question or concern about the product.
