Custom Power Bank |2| Analysis (Open Source)

Intro

This series of notes describes developing process of custom power bank.

Purpose: list of existing open-source DIY power bank for analysis of their design (main power chip, connectors, PCB, battery, etc.).

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Requirements

  1. Full of partially available Electrical Schematic, Artwork and/or design (source files)
  2. Parallel connection of cells (preferable)

List

NamePhotoSpecsNote

Link:

https://github.com/breadboardharry/ultimate-power-bank

Source (copy):

ultimate-power-bank-main_20250108.zip

Schematic:

Schematic_Ultimate_Powerbank_Powerboard_REV2_2025-03-27.pdf

Schematic_Ultimate_Powerbank_Buttonboard_2025-03-27.pdf

Schematic_Ultimate_Powerbank_BMS_2025-03-27.pdf

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  • ESP32-C3
  • BQ7721605
  • IP2368 for the main USB-C port
  • P6520_20W for the 20W USB-C port
  • IP6538 for both USB-A ports
  • SK6812 RGBW ADDR LED

ERRATA:

  • High Iq
  • Overheating

Link:

https://github.com/SebastianOberschwendtner/OTP20_oBank

Source (copy):

OTP20_oBank-main_20260112.zip

Schematic:

OTP20_oBank_Schematics.pdf

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  • Microcontroller: STM32L071
  • Battery: Li-Ion 18650 7.4V 5000 mAh
  • Charger IC: BQ25700
  • Fuel Gauge IC: MAX17205
  • PD Controller IC: TPS65987

Link:

https://github.com/Ardentis-sd/XiBank

Source (copy):

XiBank-main_20261201.zip

Schematic:

XiBank_schematic_altium.pdf

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  • IP5328P
  • 1xMicro-USB (Input)
  • 2xUSB-A (Output)
  • Compatible with commercial Xiaomi power bank (ideal for repair)
  • Size of components 0603 of bigger

ERRATA:

  • Problems with work with Baseus ยซBS-EU905ยป quick charger.

Link:

https://github.com/Smartech-git/PowerBank-PCB

Source (copy):

PowerBank-PCB-main_20261201.zip

Schematic:

Virpar_Schematic.pdf

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  • IP5328P
  • 1xUSB-C (Input/Output)
  • 1xMicro-USB (Input)
  • 2xUSB-A (Output)

Link:

https://github.com/Picomicro/Ultralight-waterproof-22.5W-10000mAh-Dual-USB-C-carbon-fiber-power-bank-with-PD3.0-QC4-support

Source (copy):

Ultralight-waterproof-22.5W-10000mAh-main_20260112.zip

Schematic:

SCH_IP5355_ABCC V1.0.pdf

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  • IP5355
  • XB8886A Battery Protection
  • 2305018-2 USB-C (waterproof)

Link:

https://www.monolithicpower.com/en/mezs7-1s-4spdpowerbank-reference-design?srsltid=AfmBOoqiX2XfmRkwYbxt-1o4Lf229SNXGe21XfkquN86qpUWh-SbMT8z

Source (copy):

MEZS7-1S-4SPDPowerBank.zip

Schematic:

mezs7-pdpowerbank-mp2651_sch.pdf

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  • 1-4S
  • MP2651 Buck-Boost Charger
  • MPF52002 PD Controller
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