Dump from my KB notes, sorry not well organized.
Ah or mAh is a much better unit for comparing capacity than Wh, so using a constant **current** discharger with a precise timer, from also precisely defined 100% SoC down to say 2.99V as a proxy for 0% is the way to go.
A slow discharge rate, 0.2C or even 0.05C will give more accurate results, but of course take longer.
Do not rely on Ah-counter "coulomb totalizers", not accurate enough.
________ https://endless-sphere.com/forums/viewtopic.php?p=1487137#p1487137
EEVBlog Dave homemade
https://youtu.be/8xX2SVcItOA
BK Precision
BK8540 150W max, 60V (2.5A) 40A (3.75V)
constant Amps, constant Voltage or constant Resistance
see Hyperion - chargers?
Cheap coulomb counter TF01N
100A version? https://m.aliexpress.com/item/32272229618.html
Cylindrical battery cell holder fixture
4-wire four-wire
https://m.aliexpress.com/item/32717327856.html
BF-2A 4-Wire Battery Charge/Discharge Fixture Holder Clamp
https://m.fasttech.com/p/5339400
BF-30-60A
aluminum alloy CNC
18650 vs 26650 separate holders?
https://m.aliexpress.com/item/32824553260.html
https://m.aliexpress.com/item/32717327856.html
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cheap small 6S? checker, light bulb discharging
myrcmart rcx-3in1 careful which one
https://youtu.be/htY2mHTx3kQ
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https://www.google.com/search?q=Electronic-Load-Constant-Voltage-Constant-Current-Constant-Power-Module-485-Communication-Control
PL8v2, or West Mountain CBA IV from westcoastmountain.com (expensive!)
It is OK to charge the Pb while using it as a power source for the Cell Pro.
Big passive vs active load devices
https://www.rcgroups.com/forums/showthread.php?2406395-An-effective-variable-load-automatic-LiPo-discharger/page32#post40969831
jj604;40969831 said:
I tested all 12 of mine and they were accurate and consistent.
Electronic load - $30+ Ali, Amazon, eBay, Banggood
10A, up to 150W @ 60V
4-wire power input, can have separate V sense
requires 12V supply
set Voltage to LVC stop point in test, and / or to protect source
Good for **under** 200Ah if using 20-hour discharge rate
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Top-notch thread
https://www.rcgroups.com/forums/showthread.php?1107072-How-to-build-a-constant-current-discharger
connect the battery straight into a MOSFET bank. An arduino to monitor the current and adjust PWM
another https://www.rcgroups.com/forums/showthread.php?3189173-New-LiPo-discharger-Maylibet
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Banggood source
https://usa-m.banggood.com/150W-Constant-Current-Electronic-Load-60V-10A-Battery-Discharge-Capacity-Tester-1602-LCD-Display-p-1255707.html
https://endless-sphere.com/forums/viewtopic.php?t=98407
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https://www.integy.com/st_main.html?p_catid=199#.XE0hIxhOl-H
https://www.rcgroups.com/forums/showthread.php?2115921-Turnigy-Reaktor-300W-20A-6S-Balance-Charger/page63#post32914586
regen tips
https://www.rcgroups.com/forums/showthread.php?2115921-Turnigy-Reaktor-300W-20A-6S-Balance-Charger/page67#post33064904
cheap 3-in-1
http://www.myrcmart.com/rcx-3in1-battery-balancer-discharger-voltage-indicator-150w-discharging-p-4767.html
4010 specific https://www.rcgroups.com/forums/showthread.php?1801512-New-iCharger-4010DUO-308DUO-406DUO-Have-Been-Released%21%21%21/page477#post41023783
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ZKE, ZKETECH
EBD USB ZKE EBD-USB Capacity tester
EBD-USB+ Electronic Load QC3.0 MTK-PE Trigger Voltage Current Capacity Tester
for 18650 other small AH Loads
Supply power: online USB power supply (5V)
- Voltage range: 0-21V
- Current range: 0-4.000A
- Test mode: constant current discharging, QC2.0/3.0 trigger, MTK-PE trigger, USB current voltage detection
- Max power: 35W
- Computer control software: support EB online software test (computer control, curve drawing, measuring datum correction, device firmware upgrade, power current test, etc.)
PC Software for logging, good for data logging
EB V1.8 Build 1018 software and PL 2303 drive
https://www.ebay.com/sch/i.html?cmd=SKW&_pgn=1&_nkw=EBD+USB+Electronic+Load
https://lygte-info.dk/review/Review%20Electronic%20load%20ZKE%20EBD-USB%20UK.html
Look for English version
Good YT channels
https://youtu.be/VDCShH-zj0U
https://www.youtube.com/channel/UCm5sG3-BXQZfVy3st2T_XKg
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EBC-A20 Battery **charger** and Capacity Tester
EBC-A20 PC programmable battery tester
review and impressions
https://m.banggood.com/EBC-A20-Battery-Tester-30V-20A-85W-Lithium-Lead-acid-Batteries-Capacity-Test-5A-Charge-20A-Discharge-Support-PC-Software-Control-p-1524239.html?rmmds=search
https://www.reddit.com/r/flashlight/comments/76jeta/ebca20_pc_programmable_battery_tester_review_and
5A Charge, so can do auto charge/discharge routine
discharge 20A (@4.2V) power 85W, so @8.4V can be 10A, and higher voltage is less than 10A
Voltage setting:0.00-30V
supply: DC19V-20V, current 3.5+A
Max 18V when charging, 5A
review
sources
Shenzhen Tianzhongtian Trading Co., Ltd. https://m.alibaba.com/product/60679055319/EBC-A20-Li-po-Battery-Capacity.html
https://m.aliexpress.com/item/32841433205.html
http://www.thanksbuyer.com/ebc-a20-li-po-battery-capacity-tester-5a-charge-20a-discharge-85w-multifunction-battery-current-test-54142
other models same company
http://zketech.m.icoc.in
http://zketech.m.icoc.in/pd.jsp?pid=21#_pp=2_303
https://m.imgur.com/JlTnlrt?r
EBC-A05
EBC-A05+
see https://youtu.be/G8Tfdbmb7L8
EBC-A10H
https://www.ebay.com/itm/Electronic-Load-Battery-Capacity-Tester-Mobile-Power-Head-Tester-Mini-USB-I-F/223496804471
Built-in 24 V power supply module.
power supply: AC110-220V
Voltage setting: Discaharge: 0.00-30.00 V, the minimum step 0.01 V
charge: 0.00-22.00 V, the minimum step 0.01 V
current setting: Discharge: 0.05-10.00 Minimum step 0.01A (power limit automatically when limit)
charge: 0.05-5.00A Minimum step 0.01A (maximum current is affected by supply current)
Discharge mode: DSC-CC: discharge current constant, used to test battery capacity or power supply current
DSC-CP discharge power is constant, used to simulate constant power equipment or test power
charging mode: standard charge: support nickel-metal-hydride, nickel-chromium, lithium, iron lithium, lead-acid
CHG-CV: custom constant current constant voltage charging, only for batteries
Automatic charging & discharging: support automatic charging-discharge-charging mode, used to test battery capacity
Voltage test: 0.000-4.500 V (low pressure) accuracy to 0.003 V, error ± 0.5%
4.50 V-30.00 V (high presure) accuracy up to 0.01 V, error ± 0.5%
current test: 0.05-10.00A, accuracy to 0.005A, error ± 0.5%
capacity test: 10Ah, the resolution of 0.001Ah
10AH-100Ah, the resolution of 0.01Ah
above 100Ah, the resolution 0.1Ah
Connection: Four-wire detection, voltage and current channel separate wiring, ensure measurement accuracy
LCD screen: voltage, current, capacity, time, power, energy test data
Computer Online: dedicated USB serial port TTL (Mini USB port, not a regular usb cable) computer control, plot plotting, calibration benchmarking, firmware upgrade, cycle charge / discharge etc.
EBD-A20H
https://www.ebay.com/itm/12V-EBD-A20H-Electronic-Load-Power-Battery-Capacity-Tester-Power-Supply-Test/123787369920
EBD-A20H higher discharge
Input Power Supply: DC 12V 1A
Voltage range (Volt Range):
Low profile: 0.000-4.500V
High speed: 4.50-30.00V
Current Range 0.20 - 20.00A (20H)
Maximum power: 120W / 150W
@30V only 5A
@12V 12A (240Ah lead bank)
@6V max 20A 120W (400Ah)
@3.2 also 20A 64W (9+hrs for 180Ah cell)
Test Mode (Test Mode):
constant current (CC) or constant power (CP)
Suitable for: Batteries and Power
LCD: voltage, current, power, time, capacity, energy and other test data
Online Software: connection via a dedicated USB to TTL serial cable
EBC-B20H is a battery capacity tester for battery capacity test 12V-72V, built-in discharge load resistance, support external charger, automatic charge and discharge, support online computer drawing curves.
Specification:- power supply: AC220V- discharge current: 0.10-20.00A (maximum 12V of 10A battery pack, 24-72V battery pack Max 20A)- termination voltage: 9.00-88.00V, suitable for 12-72V battery range- charge measurement: 0.10-20.00A
EBC-A40L
EBC-X0510
EBC-X0510A
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"Electronic Load" USB
Battery Capacity Tester
6 in 1 35W 4A Multifunction OLED USB Electronic Load CC Battery Capacity Tester
UM25C
https://www.ebay.com/itm/NEW-UM34C-USB-Tester-HD35-Intelligent-Trigger-Electronic-Load/173755905821
MakerHawk 150W
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zpb30a1 100W $30
FOSS!
https://hackaday.com/2018/09/06/zpb30a1-electronic-load-gets-an-open-firmware/
DIY hacks
100A
https://hackaday.com/2017/02/28/beefy-100-amp-electronic-load-uses-two-mosfets/
https://hackaday.com/2013/10/28/building-a-dc-constant-currentpower-electric-load/
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UM34C Type-C loads, 5A 25V 35W
+ HD35
https://www.ebay.com/itm/NEW-UM34C-USB-Tester-HD35-Intelligent-Trigger-Electronic-Load/173755905821
Other Type-C
https://www.ebay.com/itm/New-Dual-TYPE-C-USB-PD-Fast-Charge-Tester-Meter-Auto-Detection-QC3-0-2-0-4-0-JS/223447729766
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iCharger discussion
https://www.rcgroups.com/forums/showthread.php?p=41567843
________
SkyRC BD200 discharger 200W and 30A capable. At $65. Constant amps setting possible
__________
Under a very light discharge rate like the capacity testing standard C/20 (5A load per 100AH capacity), 10.5V "live" is the same SoC as around 11.8V resting.
http://www.yachtingmonthly.com/archive/battery-power-26009
http://batteryuniversity.com/learn/article/how_to_prime_batteries
http://www.cartsunlimited.net/battery-break-in-.html
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cheap
60W Electronic Dummy Load Battery Tester Banggood: http://voltlog.com/y/9lbrq
Ebay: http://voltlog.com/y/293qw
Amazon: http://voltlog.com/y/5a6be
60W Dummy Load Range Mod 20mA to 999mA https://youtu.be/K-7kgfbH-eI
60W Dummy Load Reverse Engineering Video https://youtu.be/KYncNH8_m70
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"Digital Battery Capacity Tester"
Banggood, Ali, $5, more limited than ZB2L3
5V max, **no** adjustable cutoff voltage
not really adjustable load current, set via resistor
current not CC, varies with voltage
Zhiyu
ZB206+ V1.3 Battery tester
ZB2L3 v2.0 Battery tester, 3A, 15V max
yes adjustable cutoff voltage
not really adjustable load current, set via resistor
current not CC, varies with voltage
comes with 5W resistor, replace w/ 50W & heatsink
ZPB30A1 Electronic load
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150 or 180W
8 In 1 Digital Battery Capacity Tester Voltmeter Adjustable Constant Current Electronic Load Charger USB Meter Indicator 180W
no "cutoff" voltage, just alarm
input 4~30V range
max 200V measure
20A
https://m.banggood.com/8-In-1-150W180W-Digital-Battery-Capacity-Tester-Voltmeter-p-1248703.html
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150W electronic load
60V 10A constant current electronic load.
1602 LCD display: clear and convenient for readings.
Power Supply DC 12V ±5%
Load Mode: Constant Current Load
Load Voltage: 0.5-60V
Load Current: 0-10A
Maximum Power: 150W
https://m.banggood.com/150W-Constant-Current-Electronic-Load-60V-10A-Battery-Discharge-Capacity-Tester-1602-LCD-Display-p-1255707.html
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250W Discharge Battery Capacity Tester Module With DC Electronic Load Digital Battery Tester
power supply 12Vdc
0-10A
Working Mode: Single Mode Constant Current(CC)
Set constant current through knobs.
no voltage and power limitation, but normal work should be below 100V, 250W
https://m.banggood.com/250W-DC-12V-Discharge-Battery-Capacity-Tester-Module-With-DC-Electronic-Load-Digital-Battery-Tester-p-1383823.html
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100W Battery Capacity Tester Module
ID:1337352
https://www.banggood.com/100W-DC-12V-Discharge-Battery-Capacity-Tester-Module-With-DC-Electronic-Load-Digital-Battery-Tester-p-1337352.html
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KZ35 USB Intelligent Trigger Electronic Load Tester
https://m.banggood.com/KZ35-35W-4A-USB-Intelligent-Trigger-Electronic-Load-Fast-Charge-Tester-Voltmeter-Battery-Capacity-Tester-p-1444154.html