BATTERY CHARGING

Please tell us which board you are using.
For CircuitPython issues, ask in the Adafruit CircuitPython forum.

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
maverickk89
 
Posts: 5
Joined: Tue Jan 24, 2023 5:10 pm

BATTERY CHARGING

Post by maverickk89 »

I read this post:

viewtopic.php?p=767085&hilit=HUZZAH32+B ... GE#p767085

I have the same problem, is there a guide or could someone explain how to achieve what suggested in the last comment? I mean:

1) Is there a way of increasing the charge rate to greater than 100mA?
You would have to change the charge rate resistor, which would require some SMT soldering.

Thanks a lot!

User avatar
adafruit_support_carter
 
Posts: 29159
Joined: Tue Nov 29, 2016 2:45 pm

Re: BATTERY CHARGING

Post by adafruit_support_carter »

There's no guide with specific steps and information.

The schematics for the board are available:
https://learn.adafruit.com/adafruit-fea ... /downloads
which shows the LiPo charge circuit which has the resistor which sets the charge rate.

The datasheet for the MCP73831 LiPo charger would have further details on how that resistor sets charge rate.

User avatar
maverickk89
 
Posts: 5
Joined: Tue Jan 24, 2023 5:10 pm

Re: BATTERY CHARGING

Post by maverickk89 »

thank you for the reply, I suppose that already in board's schematic it is shown how resistor should be changed:

https://cdn-learn.adafruit.com/assets/a ... 1583183441

10k --> 100mA
5k --> 200mA
2k --> 500mA
1k --> 1000mA

Now what is not clear is which resistor is that and where is it located on the board?

User avatar
adafruit_support_carter
 
Posts: 29159
Joined: Tue Nov 29, 2016 2:45 pm

Re: BATTERY CHARGING

Post by adafruit_support_carter »

This is worth reading for some general consideration about changing charge rate:
https://learn.adafruit.com/adafruit-mic ... harge-rate
There are tradeoffs to consider.

There have been minor variations to the board's layout with time. You'll need to get the PCB files from here:
https://learn.adafruit.com/adafruit-fea ... /downloads
This guide discusses how to use these files:
https://learn.adafruit.com/accessing-an ... sign-files
including how to locate parts:
https://learn.adafruit.com/accessing-an ... ting-parts

The charge rate resistor is this one connected to the PROG pin on the MCP73831.

The MCP73831 datasheet is available here:
https://learn.adafruit.com/adafruit-mic ... /downloads

User avatar
maverickk89
 
Posts: 5
Joined: Tue Jan 24, 2023 5:10 pm

Re: BATTERY CHARGING

Post by maverickk89 »

ok so far if I understood well, the resistor that I should change is that one shown in the attached image, correct?
so the next question is, where could I find the replacement with the correct resistance? I would go for the max rate e.g. 1.0K, beacuse battery I need to use is 2000-3000 mAh, what do you think?
Attachments
Adafruit_ESP8266_Huzzah.jpg
Adafruit_ESP8266_Huzzah.jpg (297.39 KiB) Viewed 50 times

User avatar
adafruit_support_carter
 
Posts: 29159
Joined: Tue Nov 29, 2016 2:45 pm

Re: BATTERY CHARGING

Post by adafruit_support_carter »

Hmm...is it really using a resistor pack? Looks like it might be. That's going to be a very tricky hardware change. You'll need to bypass only that one path of the pack since the others will need to be retained.

Locked
Please be positive and constructive with your questions and comments.

Return to “Feather - Adafruit's lightweight platform”