good 30Q/141 cycle test

4.2v to 2.5v, 0.6amp discharge capacity test

#1 3170mah



#100 3092mah



#201 3026mah



#216 3042mah



#218 3041mah



#234 3045mah



2.5v to 4.2v, 2amp charge 0.10 c/o

#1 2983mah



#100 2923mah



#201 2863



#216 2867mah



#218 2856



battery being tested using 10mm magnets/copper tape

the settings



#1 d-2519, c-2489 peak temperature 100f
#2 d-2538, c-2488
#3 d-2506, c-2469 peak temp 97f, raising temperature
#4 d-2490, c-2451
#5 d-2478, c-2439
#6 d-2466, c-2429
#7 d-2459, c-2422
#8 d-2454, c-2417
#9 d-2450, c-2414
#10 d-2444, c-2409 test stopped so i could get samsung code from its metal can, gave it 0.5amp charge before starting #11
#11 d-2467, c-2414
#12 d-2448, c-2408
#13 d-2440, c-2403
#14 d-2437, c-2402
#15 d-2437, c-2403
#16 d-2437, c-2402 peak temp 101f
#17 d-2436, c-2399
#18 d-2434, c-2399
#19 d-2433, c-2396
#20 d-2431, c-2394
#21 d-2428, c-2394
#22 d-2426, c-2394 changing 2.5amp discharge to 1.5amp
#23 d-2459, c-2423
#24 d-2459, c-2423
#25 d-2459, c-2422
#26 d-2457, c-2421
#27 d-2456, c-2421
#28 d-2456, c-2420
#29 d-2454, c-2417
#30 d-2452, c-2417
#31 d-2451, c-2414
#32 d-2448, c-2412
#33 d-2448, c-2412
#34 d-2447, c-2411
#35 d-2445, c-2409
#36 d-2445, c-2408
#37 d-2443, c-2405
#38 d-2441, c-2406
#39 d-2440, c-2405
#40 d-2439, c-2405
#41 d-2439, c-2401
#42 d-2436, c-2398
#43 d-2434, c-2397
#44 d-2432, c-2397
#45 d-2432, c-2397 peak temp 98f
#46 d-2430, c-2395
#47 d-2430, c-2395
#48 d-2430, c-2394
#49 d-2428, c-2392
#50 d-2428, c-2392
#51 d-2428, c-2391
#52 d-2427, c-2392
#53 d-2428, c-2391
#54 d-2426, c-2389
#55 d-2424, c-2390
#56 d-2424, c-2387
#57 d-2423, c-2386
#58 d-2421, c-2385
#59 d-2422, c-2386
#60 d-2421, c-2386
test stopped, changed 10amp c/o to 3.62v, 7.5amp c/o to 3.52v to raise temp and changed wait time between discharge/charge to 6 minutes. battery was at 4.17v so gave it 0.5amp charge and started cycling

#61 d-2434, c-2385 peak temp 101f, start of charge temp 85f
#62 d-2421, c-2387
#63 d-2422, c-2385
#64 d-2420, c-2382
#65 d-2417, c-2382
#66 d-2416, c-2381
#67 d-2415, c-2379
#68 d-2415, c-2378
#69 d-2413, c-2376
#70 d-2413, c-2374
#71 d-2411, c-2374
#72 d-2410, c-2375
#73 d-2412, c-2377
#74 d-2412, c-2375 stopped test for 1 hour, gave 0.5amp charge
#75 d-2420, c-2371
#76 d-2406, c-2370
#77 d-2406, c-2369
#78 d-2406, c-2371
#79 d-2401, c-2367
#80 d-2404, batteries been sitting for 8 days, it was 3.38v, it was 3.346 when i started charge
c-2361
#81 d-2413, c-2377 battery temp peaked at 110f? furnace is on now? changed settings back to 3.65v/3.55v for #82
#82 d-2410, c-2373
#83 d-2407, c-2369
#84 d-2406, c-2367
#85 d-2404, c-2366
#86 d-2404, c-2367 removed wait times between discharge/charge/discharge
#87 d-2402, c-2364
#88 d-2400, c-2364
#89 d-2401, c-2362
#90 d-2399, c-2361
#91 d-2398, c-2359
#92 d-2398, c-2360
#93 d-2398, c-2359 going back to 5min/2min wait
#94 d-2396, c-2357
#95 d-2397, c-2358
#96 d-2397, c-2356
#97 d-2395, c-2356
#98 d-2395, c-2355
#99 d-2394, c-2357
#100 d-2395, c-2355
0.6amp capacity test, #1-3170mah, #100- 3092mah. 78 mah loss
#101 d-2542, c-2501 i dont know whats happened with these numbers, im going to shut down and restart in the morning
#102 d-2528, c-2486
#103 d-2517, c-2472
#104 d-2501, c-2456
#105 d-2489, c-2445
#106 d-2479, c-2435
#107 d-2470, c-2427 shutdown and restart
#108 d-2463, c-2421
#109 d-2458, c-2416
#110 d-2455, c-2413
#111 d-2450, c-2408
#112 d-2446, c-2405
#113 d-2442, c-2401
#114 d-2440, c-2398
#115 d-2438, c-2396
#116 d-2436, c-2393
#117 d-2432, c-2391
#118 d-2431, c-2388
#119 d-2429, c-2386
#120 d-2427, c-2387
#121 d-2428, c-2384
#122 d-2424, c-2384
#123 d-2426, c-2385
#124 d-2425, c-2382
#125 d-2423, c-2382
#126 d-2421, c-2380
#127 d-2420, c-2377
#128 d-2417, c-2376
#129 d-2416, c-2373
#130 d-2413, c-2370
#131 d-2413, c- usb cable was pulled from computer at 2100 mah, gave it a charge top up
#132 d-2418, c-2371
#133 d-2414, c-2373
#134 d-2411, c-2370
#135 d-2410, c-2367
#136 d-2407, c-2366
#137 d-2408, c-2366
#138 d-2406, c-2364
#139 d-2405, c-2364
#140 d-2405, c-2362
#141 d-2406, c-2365
#142 d-2405, c-2363
#143 d-2404, c-2364
#144 d-2404, c-2363
#145 d-2404, c-2362
#146 d-2401, c-2361
#147 d-2400. c-2359
#148 d-2400, c-2357
#149 d-2399, c-2358
#150 d-2399, c-2359
#151 d-2398, c-2355
#152 d-2397, c-2355
#153 d-2396, c-2355
#154 d-2396, c-2354
#155 d-2393, c-2352
#156 d-2395, c-2353
#157 d-2395, c-2352
#158 d-2393, c-2351
#159 d-2392, c-2351
#160 d-2392, c-2351
#161 d-2391, c-2349
#162 d-2392, c-2349
#163 d-2391, c-2351
#164 d-2390, c-2349
#165 d-2391, c-2350
#166 d-2390, c-2348
#167 d-2388, c-2350
#168 d-2391, c-2349
#169 d-2387, c-2350
#170 d-2389, c-2349
#171 d-2389, c-2347
#172 d-2389, c-2347
#173 d-2388, c-2347
#174 d-2387, c-2346
#175 d-2386, c-2345
#176 d-2386, c-2345
#177 d-2386, c-2346
#178 d-2386, c-2345
#179 d-2386, c-2342
#180 d-2383, c-2341
#181 d-2381, c-2339
#182 d-2380, c-2339
#183 d-2379, c-2337
#184 d-2379, c-2338
#185 d-2379, c-2336
#186 d-2393, c-2335
#187 d-2379, c-2336
#188 d-2377, c-2335
#189 d-2375, c-2335
#190 d-2376, c-2333
#191 d-2376, c-2334
#192 d-2376, c-2334
#193 d-2375, c-2333
#194 d-2374, c-2332
#195 d-2374, c-2332
#196 d-2374, c-2331
#197 d-2373, c-2331
#198 d-2373, c-2329
#199 d-2371, c-2330
#200 d-2372, c-2329
#200 d-3026, c-2863 capacity test
#201 d-2497, c-2453
#202 d-2486, c-2442
#203 d-2474, c-2429
#204 d-2461, c-2416
#205 d-2449, c-2405
#206 d-2441, c-2395
#207 d-2430, c-2387
#208 d-2425, c-2381
#209 d-2418, c-2373
#210 d-2414, c-2369
#211 d-2409, c-2366
#212 d-2406, c-
test stopped and battery was stored at 3.286v/nov.01,2020

charged battery placed in fridge for 18 hrs at 5 celsius and restart the test
#213 d-2366, c-2332
#214 d-2374, c-2332
#215 d-2376, c-2334
doing 0.6amp discharge capacity test to see if lost mah can be recovered
#216 d-3042, c-2867 capacity test
back to cycle test
#216 d-2460, c- microsoft shutdown and restarted my computer so lost the charge data and restarted test
#217 d-2420, c-2364
doing 0.6amp capacity test
#217 d-3041, c-2856 if you go to capacity chart in first post youll see the "bump" at 3.45v smoothing out
#218 d-2455, c-2413
#219 d-2444, c-2399
#220 d-2430, c-2385
#221 d-2416, c-2371
#222 d-2404, c-2358
#223 d-2394, c-2349
#224 d-2386, charged to 3.79v and put on shelf dec,13
dec.16, battery is 3.782v, charge to 4.2v and resume testing
#225 d-2367, c-2325
#226 d-2362, c-2318
#227 d-2357, c2313
#228 d-2352, c-2308
#229 d-2347, c-2305
#230 d-2344, c-2300
#231 d-2339, c-2296
#232 d-2339, c-2293
#234 d-2334, c-2290
#235 d-2331, c-2287
#236 d-2325, c-2283
#237 d-2324, c-2281
#238 d-2321, c-2277
#239 d-2318, c-2274
#240 d-2314, c-2270
#241 d-2312, c-2265
while doing capacity test, we had a power outage in the middle of test. test stopped and resumed so i just added the numbers together,
d-2992, c-2830 didnt like the curve so did another capacity test
d-3045, c-

#243 d-2394, c-2352
#244 d-2388, c-2343
#245 d-2380, c- charged to 3.79v. dec.19 and put on shelf. i think im done testing

at 0.6amp discharge to 4.1v= 73mah

first charge from 3.4v to 4.2v

10 amp curve



close up of cycle #2 10amp sag

removed wait times between discharge/charge/discharge to see mah loss/cycle

#87 d-2402, c-2364
#88 d-2400, c-2364
#89 d-2401, c-2362
#90 d-2399, c-2361
#91 d-2398, c-2359
#92 d-2398, c-2360
#93 d-2398, c-2359 going back to 5/2minute wait and post results above

Have you ever thought that the results which you achieved could be presented, how to say, less chaotically?

For newbies like me, will be fine to present your tests results also in simple "capacity fade" graphs

newbs like you :lol:

i hear what youre saying, im not a computer guy or a battery guy its a learning curve and i get distracted with bunk cells or self healing batteries so it is all over the place and then i only have 1 tester. i could put my results in one thread when im done like docs.

how does he even do it? im sure its not hard, i just dont know what program he uses.

goatman said:

newbs like you :lol:

i hear what youre saying, im not a computer guy or a battery guy its a learning curve and i get distracted with bunk cells or self healing batteries so it is all over the place and then i only have 1 tester. i could put my results in one thread when im done like docs.

how does he even do it? im sure its not hard, i just dont know what program he uses.

Click to expand...

I mean just to use excel and create capacity fade graphs from your results. You have already about 100 cycles per some cells. The best approach is to add all similar cells results 30Q, VTC6 or HG2 into the same graph.

after the capacity test at #100 and the mah jump, i shutdown and reset but the result was the same so im just going to let it cycle the same as the first 100 and after the capacity test #200, see if it happens again

the 30Q datasheet has changed

old datasheet

https://www.18650batterystore.com/v/files/samsung_30q_data_sheet.pdf

new datasheet

https://eu.nkon.nl/sk/k/30q.pdf

the old datasheet had the 30Q capacity discharge like a 25r or 20Q but not anymore, heres a sketch

#200 d-2372, c-2329
#200 d-3026, c-3063 capacity test
#201 d-2497, c-2453

“test stopped and battery was stored at 3.286v/nov.01,2020”

How long did you plan to store at 3.286v? What is self-discharge voltage after two weeks?

when i stopped the test, i stopped testing because Endless Sphere was having issues and i couldnt upload the data and i saw that the observation made after capacity test performed at cycle #100 repeated after cycle #200. so i shutdown and recorded the voltage without waiting an hour for the voltage to bounce back up and stabilise. its sitting at 3.360 volts right now

its Dec.10, battery voltage is 3.332v, going to charge and stick in fridge at 5 celsius for 24hrs and do a discharge

battery was in fridge for 18 hrs at 5 celsius, voltage was 4.161v at start of discharge

volt sag at 10 amps (3.84), i added a picture of cycle #218- 10amp volt sag at room temperature below for comparison (3.92)





volt sag at 10/7.5 switch



volts at 7.5/5 switch



end of discharge



mah per stage



2366 mah