*** Update *** These batteries were shipped out today.
I accidently got the battery pack wet while cleaning my Dyson V8 vacuum, so I ordered a new battery pack. I took apart the wet pack and now have six of these batteries, all reading around 4 volts. No idea on capacity. Pretty sure they are 21700 size. I already have several Dyson 20700 batteries (pictured) and about ten 18650’s on hand. So, I don’t need these. They need a little TLC, to clean off the foam and remove the soldered metal parts.
I have two flashlights that came with a little plastic sleeve so an 18650 will size up and work. For those lights, these 21700 size fit perfect…at least for the two lights I have they fit.
If someone will reimburse me for shipping, I’ll send them out. UPS Ground only.
Let me know. Shipping from North Texas to you should be about $7-8, but I won’t know for sure until I make a shipping label.
The first pic shows what I will send. The second pic is for size reference only. I’m not shipping out the Dyson, the pink or the purple ones.
Received these cells today .
Cleaned them up and put 4 on the charger. They were about 4 volts and i noted the internal resistance on them .
The first cell was 16 mR #2 had 18 mR #3 had 18mR #4 had 30mR
The numbers are so good I’m not even going to bother doing a full test on these .
Low internal resistance is a way of measuring the well-being of the cell .
A low resistance cell is like a glass that’s empty and can take a full 16 oz of water. The high the resistance is like a glass thats got a massive amount of calcium build up so you can only get 8 oz. Into the glass and 8oz. Out . The capacity is degraded .
Feel free to join my weakly battery for dummies discussion .
Cells with a low Internal resistance is a very good sign of overall health .
the last two are 16mR and 22mR
Both just great numbers .
The chargers that tell you internal resistance are to be taken with a grain of salt but can give you an idea of the general state of health when compared against everything else thrown in the charger .
the cells came almost fully charged and internal resistance numbers of cells with higher voltage in them almost always produce better / lower numbers.
Hopefully someone smart will come along and explain where I’m wrong .
