There are a few Chinese manufacturers (specifically Shenzhen Baiguan Battery Co., Ltd) who produces a few nice batteries.
From what I can tell, SZN might be an abbreviation for Shenzhen - a manufacturing city in China - similar to LAX being short for Los Angeles, but I don't really know.
My images look very similar to Jeff's above, so I'm not going to post any.
I cannot find the spec sheets for this specific cell, but , theyre definitively not made by any of the so-called respected manufacturers Sanyo, Panasonic, Sony (Japan), LG, Samsung (Korea), BAK (China), Moli (Canada/Taiwan) and others. However, they seem pretty good for me. If anyone can find spec sheets for this specific cell, I'd be interested in seeing them.
Here are some google links and findings I have found this far:
https://www.alibaba.com/product-det...ml?spm=a2700.7724838.2017115.1.7616faa6r0jtAo
https://www.alibaba.com/product-det...?spm=a2700.7724838.2017115.474.7616faa6r0jtAo
Some pretty cool photos on this link too:
http://www.appliances-china.com/supplier/b/baiguan/Product_Look.php?ProID=353251
I have a few of these CJ cells shown in the images in the links above also (in blue), but here. Not exactly the same, but interesting.
the CJ cells are listed as aso/szn - very curious.
I have seen published capacity as:
"Nominal capacity - 2000mAh-3000mAh @ 0.2C Discharge"
and others show them to be "2600 mAh"
BTW, the ones I have Mine are purple wrapper with grey insulator bands.
Markings are:
aso gi1i151ef 811563 / barcode / szn
aso gi1i151ef 821153 / barcode / szn
aso gi1i151ef 821100 / barcode / szn
aso gi1i151ef 821142 / barcode / szn
aso gi1i151ef 81153 / barcode / szn
aso gi1i151ef 81153 / barcode / szn
aso gm2l291ef 800613 / barcode / szn
aso gm2l291ef 800615 / barcode / szn
aso gm2l291ef 800614 / barcode / szn
aso gm2l291ef 800607 / barcode / szn
aso gm2l291ef 800609 / barcode / szn
aso gm2l291ef 800612 / barcode / szn
It appears that the third number is the serial number, and the second number is the type of battery:
I have two distinct models, they are:
gi1i151ef
and
gm2l291ef
I pulled 12 of them from a couple of packs this weekend and they all tested really well:
Yes, It seems like the bms board crapped out on them and they sat for a long time. Charged very well, low impedance, and good capacity.
Date 1st charged test charger charger test slot Voltage at start of test Voltage at end of test Max Temp (Farenheit) Internal Cell Resistance (mOhms) Charge Capacity when first charged from standing voltage Time taken for full charge cycle
20171120 opda1 1 2.66 4.16 84 112 2354 5:26
20171120 opda1 2 2.84 4.16 85 101 2362 5:23
20171120 opda1 3 2.66 4.17 84 95 2404 5:36
20171120 opda1 4 2.56 4.15 83 102 2263 5:12
20171120 opda2 1 2.84 4.16 84 90 2245 5:11
20171120 opda2 2 2.55 4.17 85 109 2319 5:26
20171120 opda2 3 2.53 4.16 85 126 2235 5:17
20171120 opda2 4 2.61 4.16 84 135 2271 5:30
20171120 opda3 1 2.61 4.16 85 141 2300 5:31
20171120 opda3 2 2.67 4.16 85 100 2276 5:22
20171120 opda3 3 2.67 4.16 85 128 2303 5:32
20171120 opda3 4 2.53 4.17 85 107 2310 5:40
Smiles, Howie.