Did my Logitech Spotlight die, or did the charging cable die?
I had not presented for a couple of years because of my cancer. So I tried to recharged my hardly used Logitech Spotlight presenter. No light would turn on. I thought it was the USB cable being broken.
In stead, they should have made the already large plug just 5mm larger so you could pull on the plug itself instead of the strain relief.
Repeatedly pulling the cable out by not firmly grabbing that little left over piece of the strain relief will break break the cable around the strain relief end.
The result of grabbing that end is nail markings on the strain relief. You have to press that hard to get the plug out. Some people cannot manage that and resort to pliers: not good for the cable either.
It is an example of planned obsolescence If you do not use the Spotlight presenter for a long time, the battery will discharge below a point that the device can charge it. If you remove the back cover (which causes scratches), you can charge the battery directly until it has a bit of charge, then continue charging using the
This problem is easy enough to solve for anyone comfortable with an Xacto knife and who has a 9V battery and two wires with dexterity or tape to hold it all together for a minute.
Remember lithium ion cells that come in pouch or prismatic (cuboidal) shape are marked this way.
The number (802035) can be split into 3 parts here:
80 – 8 mm
20 – 20 mm
35 – 35 mm.
These are in L x W x T (Length x Width x Thickness) form, and indicate the dimensions of the pouch .
Cylindrical cells have only 2 measurements: Length and Diameter. Radius is not used as you cant measure it just like that.
Some examples of cylindrical cells are 18650, 2170, 3265, 4680 etc
For case 1 (18650) the cell has 18 mm diameter and 65 mm length/height.
For case 2 (2170) the cell has 21 mm diameter and 70 mm length/height.
For case 4 (4680) the cell has 46 mm diameter and 80 mm length/height.
Case 3 applies on Lithium Ferro Phosphate (LFP) battery chemistry and it has 32 mm diameter and 65 mm length/height.
For non rechargeable lithium ion cells used in digital watches that so many young people wanted to sport on their hands in school/college have got a special cell shaped like a coin inside them. Today smart keys supplied with cars and electric two wheelers (and bigger motorcycles with keyless entry) have these coin shaped cells in common. Even the CMOS (timekeeping) battery inside is one of these.
A common coin cell measures 32 mm in diameter and only 2 mm in thickness/length. The cell is called CR2032. (C = Coin, R = Round and the rest follows the pattern discussed above). Coin cells have a double the terminal voltage (3 V) compared to a normal pencil cell (1.5 V).
The Wiert Corner - irregular stream of stuff 
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