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Opus BT-C700 from aliexpress for charging AA/AAA cells, mine works well for years now with the occasional abuse of suspicious cells._

DS 18650F, date code 2017I25, dark purple sleeve, grey separator, found in the bin, to be tested._

LGEBM261865, serial number P054B232A2, 2600mAh, dark purple sleeve, white separator, found in a bin charged, addition to collection._

BFN ICR18650 2000, date code MH60385 17I20, light blue sleeve, white separator, found in a bin, internally shorted._

LY 18650-AH00, date code(?) FD25, teal sleeve, grey separator, found in a bin, internally shorted._

Had one of these (US18650VT3) just die from just sitting in a power bank with no use, it is completely open circuit._

Kreosan turned one to flare with far less damage from a hammer, was the cell discharged before it was smashed like this?_

I have a 1 1/2 Monte Pero coffee jars full of these cells. I need to source some of these SMD resistors first, but it looks like if to keep it 24/7 the charge current will drop down to 200mA quite fast._

I got 7 small 3,7V batteries out of a disposable e-cigarettes I salvaged. Are these cells any good&rechargeable? I know bigclive got few to successfully recharge._

Found these in a Sony VGP-BPS2C battery pack. Cell origin: Japan, capacity 2600mAh. Last 8 digits are probably serial number as all 6 have different numbers._

It's risky as the bench power supply may not be accurate enough to limit the voltage output. You can get a lithium battery charger boards (TP4056A based works a treat) from aliexpress dirt cheap and feed 5 volts from power supply to the board._

Little clarification about different color rings: UR18650A's manufactured in Korea has white ring, but ones made in Japan has purple. Got both out of two Dell J1KND battery packs that stated the cell origin._

YR1030+ uses an USB plug for connecting probes with device which is not great for measuring low resistance.

I think the problem with pouch and prysmatic cells is that there are too many different sizes to be useful to reuse unless you want to make USB power banks out of 1-8 cells or a mosaic out of cells. Here's my start though.

Have 7 of these with R2112 serial number, charged 3 with one UR18650F mixed in a 4 cell charger (usb power bank M09)and UR18650A-s went scolding hot at 500mA charge current while been half way from fully charged._

I have 5 UR18650F L37 with red ring and almost translucent red sleeve. Cells have LHTFJ15 112875 printed onto metal under the sleeve._

I also have a single specimen in dark purple wrapping and white insulator. Serial numberH2663806664 NI223D8B3._

I am an electrician, 33 years old, single,currently living in a single room apartment in Tallinn. Just recently I found quite a few18650 so I started to research on building my own power wall.

I'm exploring the possibility of reusing pouch cells as well, currently I have three different packs of 4*11,4Wh pouches, 6*7,33Wh(1930mAh) pouches and 3*unknown prismatics._

Found 8 pcs. of Samsung ICR18650-22HU that seemed to be missing from database. Light green wrapper, white insulator.