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A compact adapter board that lets standard RC chargers safely charge 1S batteries

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Tomas-Kuchta-FPV/1S-charging-board

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1S charging board

A compact adapter board that lets standard RC chargers safely charge 1S batteries.

It allows you to charge up to six 1s batteries on a universal RC charger.
Some chargers can display series resistance and capacity. So you know the conditions of the cells..
Connectors like BT2.0/A30 and XT30 are suported. And with an adapter, you can charge 18650 batteries.

Photos

Finished project

Finish

Main PCB

Main PCB

XT30 to 18650

XT30 to 18650

Motivation

I have a great RC charger (ISDT D1), and it measures internal resistance and capacity, which is awesome!
There are a lot of 18650 cells of unknown condition lying in my workshop. I would like to know if they are still good or if they belong in the trash..
Also, I love RC hobby. So why not use a universal both RC charger for RC and maker stuff??
That's why there is a main PCB with XT30 and BT 2.0 connectors. And an extension board for 18650..

Design constraints

  • It should work with these battery types and connctors:
    • Modular design with BT2.0 on top and XT30 on the sides for modules.
    • XT30 - Main board
    • BT2.0 / A30 Main board
    • PH2.0 - future adapters if I need them
    • 18650 batteries - XT30 to 18650
  • easy to use
  • A fuse - 2A Polyfuze
  • 6S MAX

BOM

Item Qty Price Link
BT2.0M 6 7.15 https://www.aliexpress.com/item/1005004465425088.html
2A Polyfuse 1 0.51 https://www.lcsc.com/product-detail/C960026.html
XT60 - Power Input 1 0.59 https://www.lcsc.com/product-detail/C98732.html
1x7P - Balance input 1 0.54 https://www.lcsc.com/product-detail/C144398.html
2x07 PinHeader 1 1.4 https://www.lcsc.com/product-detail/C2897408.html
XT30M 6 1.72 https://www.lcsc.com/product-detail/C431092.html
XT30F 6 1.92 https://www.lcsc.com/product-detail/C2913282.html
18650 holder 6 7.52 https://www.lcsc.com/product-detail/C2988620.html
LCSC Shipping 11.2
PCB fabrication + shipping 2 21.9
54.45

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A compact adapter board that lets standard RC chargers safely charge 1S batteries

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