PCBs for battery based sensor

[jumping]

Hello,
I'm working on two projects, both of them with RFM and NRF option: what do you think? Are the PCBs correct?

1. First PCB
   

[jumping]

1. PCB with SMD resistors and capacitors with LIPO module, arduino module and radio module

[ileneken3]

I know little about hardware design, but I will comment on the TP4056 :

I originally planned on using a LIPO battery with a TP4056, but then read that the batteries can't withstand cold weather. (I wanted it for a mailbox). Could the board also support the newer, LifeP04 batteries? There is probably an interface board for those too, and they would be more efficient because you don't have to regulate the voltage (they operate at 3 V).

Thanks

[jumping]

@ileneken3
my PCB use a cheap and easily available TP4056 charger, for LiFeP04 batteries you can use charger like this: https://www.tindie.com/products/xorbit/lifepo4weredusb/

but I have good news, I found an interesting article http://nerdralph.blogspot.it/2016/01/a-36v-lifepo4-charger-for-under-50c.html maybe I can integrate a LiFePO4 charger on my PCB

[ileneken3]

@jumping

Consider this:

https://www.aliexpress.com/item/1PCS-TP5000-4-2V-3-6V-1A-Lithium-Battery-Charging-Board-Charger-Module/32756803176.html?ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10084_10083_10080_10082_10081_10060_10061_10062_10056_10055_10037_10054_10033_10059_10032_10078_10079_10077_10073_10096_10070_10052_423_10050_424_10051,searchweb201603_2&btsid=e6d6960b-1c4d-48ce-b291-cde58e005c58

It's not as cheap as a TP4056, but it allows you to choose between battery technologies.