# Single-Slot 18650 SOH Analyzer Prototype ## Description 100 mm x 140 mm ESP32-based 18650 battery state-of-health analyzer prototyping board with active MOSFET discharge switching, current/voltage measurement, OLED UI, DS18B20 temperature input, and fan control. ## Project Details - **Owner:** aditya1902singh - **Created:** 5/18/2026 - **Last Updated:** 5/18/2026 - **Visibility:** Public ## Key Components ### D1 — [1N5819](https://www.flux.ai/jecstronic/1n5819~dbj.md) - Manufacturer Name: STMicroelectronics - Part Type: Diode - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N5819 - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/26/db/14/60/52/47/47/5b/CD00001625.pdf/files/CD00001625.pdf/jcr:content/translations/en.CD00001625.pdf **Pins:** - A [pin 2] - K [pin 1] ### D2 — [LED-THT-5MM](https://www.flux.ai/vasy_skral/led-tht-5mm~od.md) - Forward Voltage: 2.1V - Role: Signal Generation - Part Type: LED - Role Details: Green status indicator LED. **Pins:** - A [pin 2] - K [pin 1] ### D3 — [LED-THT-5MM](https://www.flux.ai/vasy_skral/led-tht-5mm~od.md) - Role Details: Green status indicator LED. - Forward Voltage: 2.1V - Part Type: LED - Role: Signal Generation **Pins:** - A [pin 2] - K [pin 1] ### D4 — [LED-THT-5MM](https://www.flux.ai/vasy_skral/led-tht-5mm~od.md) - Role Details: Yellow status indicator LED. - Forward Voltage: 2.1V - Role: Signal Generation - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### D5 — [LED-THT-5MM](https://www.flux.ai/vasy_skral/led-tht-5mm~od.md) - Role Details: Yellow status indicator LED. - Part Type: LED - Role: Signal Generation - Forward Voltage: 2.1V **Pins:** - A [pin 2] - K [pin 1] ### D6 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Manufacturer Part Number: LTL-307EE - Manufacturer Name: Lite-On Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf **Pins:** - A [pin 2] - K [pin 1] ### D7 — [LTL-307EE](https://www.flux.ai/vasy_skral/ltl-307ee~a2.md) - Manufacturer Part Number: LTL-307EE - Manufacturer Name: Lite-On Inc. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1153/LTL-307EE.pdf **Pins:** - A [pin 2] - K [pin 1] ### F1 — [178.6764.0001](https://www.flux.ai/jecstronic/178p6764p0001~4jo.md) - Current Rating: 2A - Manufacturer Name: Littelfuse/Commercial Vehicle Products - Part Type: Circuit Protection - Role: Protection - Manufacturer Part Number: 178.6764.0001 - Role Details: Input overcurrent protection using a 2A blade fuse. - Datasheet URL: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=3f05f551-560b-4050-ab12-a352111d7ba3&filename=littelfuse-fuse-holder-mini-fl1-datasheet.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [PJ-037A](https://www.flux.ai/vasy_skral/pj-037a~6cq.md) - Datasheet URL: https://www.cuidevices.com/product/resource/pj-037a.pdf - Manufacturer Part Number: PJ-037A - Part Type: Connector - Manufacturer Name: CUI Devices **Pins:** - Center pin [pin 1] - Terminal [pin 2] ### J10 — [Pin Socket 01x04 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x04-254mm-vertical~kks.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] ### J2 — [282837-2](https://www.flux.ai/lcsc/282837-2~7jff.md) - JLCPCB Part Class: Extended Part - Package or Case Code: CONN-TH_2P-P5.08_282837-2 - LCSC Part Number: C592976 - Manufacturer Name: TE Connectivity(泰科电子) - Manufacturer Part Number: 282837-2 - Part Type: Connector - Datasheet URL: https://www.farnell.com/datasheets/3257301.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [282837-2](https://www.flux.ai/lcsc/282837-2~7jff.md) - LCSC Part Number: C592976 - Package or Case Code: CONN-TH_2P-P5.08_282837-2 - JLCPCB Part Class: Extended Part - Datasheet URL: https://www.farnell.com/datasheets/3257301.pdf - Part Type: Connector - Manufacturer Part Number: 282837-2 - Manufacturer Name: TE Connectivity(泰科电子) **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - P1 [pin 1] - P2 [pin 2] ### J5 — [1730405](https://www.flux.ai/adrian95/1730405.md) - Manufacturer Name: Phoenix Contact - Datasheet URL: https://www.phoenixcontact.com/en-us/products/printed-circuit-board-terminal-mkds-25-3-508-1730405?type=pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1730405 - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### J6 — [Pin Socket 01x15 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x15-254mm-vertical~mqk.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J7 — [Pin Socket 01x15 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x15-254mm-vertical~mqk.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_11 [pin 11] - Pin_12 [pin 12] - Pin_13 [pin 13] - Pin_14 [pin 14] - Pin_15 [pin 15] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J8 — [Pin Socket 01x06 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x06-254mm-vertical~yiu.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### J9 — [Pin Socket 01x10 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x10-254mm-vertical~080.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### Q1 — [IRLZ44NPBF](https://www.flux.ai/jecstronic/irlz44npbf~kg9.md) - Manufacturer Part Number: IRLZ44NPBF - Part Type: Transistor - Datasheet URL: https://www.mouser.com/datasheet/2/196/Infineon_IRLZ44N_DataSheet_v01_01_EN-3363447.pdf - Manufacturer Name: Infineon Technologies - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### Q2 — [IRLZ44NPBF](https://www.flux.ai/jecstronic/irlz44npbf~kg9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Part Number: IRLZ44NPBF - Manufacturer Name: Infineon Technologies - Datasheet URL: https://www.mouser.com/datasheet/2/196/Infineon_IRLZ44N_DataSheet_v01_01_EN-3363447.pdf **Pins:** - D [pin 2] - G [pin 1] - S [pin 3] ### SW1 — [TS-1002-10026](https://www.flux.ai/jharwinbarrozo/ts-1002-10026~q6p.md) - Manufacturer Name: XUNPU - Part Type: Switch - Manufacturer Part Number: TS-1002-10026 - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_XUNPU-TS-1002-10026_C455101.pdf **Pins:** - 4 [pin 4] - 3 [pin 3] - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1002-10026](https://www.flux.ai/jharwinbarrozo/ts-1002-10026~q6p.md) - Manufacturer Name: XUNPU - Part Type: Switch - Manufacturer Part Number: TS-1002-10026 - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_XUNPU-TS-1002-10026_C455101.pdf **Pins:** - 4 [pin 4] - 3 [pin 3] - 1 [pin 1] - 2 [pin 2] ### SW3 — [TS-1002-10026](https://www.flux.ai/jharwinbarrozo/ts-1002-10026~q6p.md) - Manufacturer Name: XUNPU - Part Type: Switch - Manufacturer Part Number: TS-1002-10026 - Datasheet URL: https://datasheet.lcsc.com/lcsc/2304140030_XUNPU-TS-1002-10026_C455101.pdf **Pins:** - 4 [pin 4] - 3 [pin 3] - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/aditya1902singh/single-slot-18650-soh-analyzer-prototype~9e](https://www.flux.ai/aditya1902singh/single-slot-18650-soh-analyzer-prototype~9e).* --- *Generated from [https://www.flux.ai/aditya1902singh/single-slot-18650-soh-analyzer-prototype~9e](https://www.flux.ai/aditya1902singh/single-slot-18650-soh-analyzer-prototype~9e)*