Probably two stupid questions

6 posts / 0 new
Last post
Harters
Offline
Last seen: 1 week 2 days ago
Joined: 10/07/2020 - 17:57
Posts: 9
Location: UK
Probably two stupid questions

Hi everyone,

I recently got my first real light… a Haikelite HK04 from another BLF member…and it’s great.

I was reading the instructions and am confused about 2 things

1. The instructions say “Unscrew the battery tube and insert the three 18650 cells. Note that the lamp requires button-top type cells. Take care to observe the correct polarity for each cell.”
That’s all OK but then it says “Double check the polarity every time before closing. The lower seated batteries must point with plus (nipple) towards the head. The higher ones must look with plus to the open back!. All flat ends look at the springs”

so I have a number of issues here… the light takes 3 cells so not sure how both “lower seated batteries” and “higher ones” can be referred to as plural (chinese translation of course so fine) but when I look at the unit all the springs are the same height and in any case, it says “all flat ends should look at the springs” …so what’s this all about lower seated and higher ones??

2. I put all 3 batteries in with nipples up and the unit works… on placing back into my miboxer charger, two of the cells have gone from 100 to 80% and one from 100 to 98%. Does this mean im running on two cells only…i honestly can’t see any markings on the light to help and as i said all the springs are same height and the batteries when dropped down the holding tubes all sit at the same height.

Robin Dobbie
Offline
Last seen: 1 hour 13 min ago
Joined: 04/30/2019 - 12:49
Posts: 330
Location: Texas

All cells point the same direction. All cells point up, toward the head.

Harters
Offline
Last seen: 1 week 2 days ago
Joined: 10/07/2020 - 17:57
Posts: 9
Location: UK

Thanks Robin, Looks like a decent video…shame i dont speak a word of Chinese lol… but pictures paints a thousand words…. is see from this video the light works with any amount of batteries so wonder if one of the cells wasn’t connecting properly

Robin Dobbie
Offline
Last seen: 1 hour 13 min ago
Joined: 04/30/2019 - 12:49
Posts: 330
Location: Texas

Based on some other videos it’s Thai, I think. There might be better videos, that was just the first I saw and I muted and skimmed until I saw the battery installation.

It’s certainly a possibility that not all the cells are connecting. If it were me, I might start by cleaning all the contacts of the light and cells to make sure there aren’t any oils or anything like that getting in the way.

So the cells are used. Maybe check their internal resistance. Do you have a method of doing a capacity test?

Do you have a camera with manual mode? I was thinking you could set up the camera on a tripod, lock the location of the light, and do beamshot comparisons between each cell, one at a time. Crazy idea if you don’t have any other test equipment.

SIGShooter
SIGShooter's picture
Offline
Last seen: 45 min 7 sec ago
Joined: 07/14/2013 - 02:10
Posts: 2009
Location: northern california

If they’re all making contact then they should be at the same voltage after you remove them from the flashlight. If you have a DMM measure the voltage after taking them out.

9mm/40cal/45cal bullets and large/small pistol primers available for sale in San Francisco Bay area

rdhood
Offline
Last seen: 45 min 39 sec ago
Joined: 09/24/2020 - 09:15
Posts: 40
Location: Dahlonega, Ga

Yeah, It sounds like you have one cell not making a good connection. Also note the cell position, and try a different cell in that position and see if the failure to discharge is associated with that cell or its position in the holder you can also try cells one at a time in each position.