I have an Imalent HR20 Neutral White which I have been LOVING (was going to change the emitter to a Nichia but it proved too complex).
BUT I have experienced a rather annoying and major problem. Everytime The tailcap is hit, the light switches off. Whether a drop, tap on a table or even just hitting the palm of my hand - it shuts off! I just tap the switch and it turns back on. Arrrrr!!!
Is this an easy fix? I’m sure BangGood will take care of it but I’d rather not wait another 3 weeks!
Also where can I purchase spare tailcap springs (whether for this headlamp or Thrunite TH20)?
Hey thanks lumenzilla. However these are not soldered in. Just popped in and out (there is only spring at tail no spring at the head). Are you suggesting to solder the existing one in? Where do I get a more beefier spring? I already have a 3500mah longer battery.
can you tell if the battery is loose or feel it jiggling when you shake the light? This will tell you if the battery is losing contact with the spring. Also, you can test this by adding a magnet to the battery to see if the problem resolves. If it does, then you should solder a spring onto the driver side where there is no spring. Springs can be found at banggood or AliExpress or kaidomain.com.
If this doesn’t solve your problem, then your tailcap might not be tight or the driver losing ground or a bad solder joint or… but start with the springs
There’s only a tiny spot for a spring on the driver, so you’ll have to either solder the spring upside down or put a taller piece of brass in stead of the stock flat one.
I can feel the battery shake ever so slightly when I shake the headlamp vertically.
With it plugged in and charging, I can slam the tailcap in the palm of my hand and the light stays on. While plugged in, no matter what I do, the light stays on.
The above tells me that indeed the battery is loosing contact with the spring!
I put in a magnet between the bottom spring and battery bottom It won’t turn on at all.
Hmmm…
Is the magnet too thick so the tailcap doesn’t screw on far enough?
Maybe you have a flatter coin that might fit?
It would be nice to first make sure what the problem is, and in this case, test if adding length to the battery makes a difference.
Is your cell protected or unprotected? Does it have a nipple/solder blob? The DM21T I have does not work with an unprotected cell unless, I use a 1/4 inch, thick, magnet as a spacer. A protected cell fits well.
Well the battery I used has very small circumference that doesn’t fit snug in the tube so maybe is slid off when I screwed the tailcap back on.
When I shake it there is a very slight movement of battery inside. I’m shaking it vertically so it may be breaking contact with driver and or tailcap spring briefly.
I put a dime below the spring in tailcap (battery negative touches spring) and light wouldn’t turn on.
I stretched the spring but because it is of such narrow gauage, it squished back.
My cell is protected although the top nipple looks indented. Maybe just enough to break contact?
Alas, I cannabalized a cheapo $3 flashlight and got the spring. I inserted the spring on the driver side of the battery with the narrow cone of spring touching driver and wider end touching the positive of battery and…
THAT FIXED IT! No matter how hard I tap or even drop the headlamp on tailcap it won’t shut off. Now this is fine for a temporary solution.
Can I solder that spring to the driver side? If so which direction should the spring face? What part of the driver board would I solder the spring too?
Or what conductive element/ device can I pop in as a spacer (any coins)? Brass, copper or? At which end is the spacer used?
