Can we use any 3.7v battery with this board like the 1/2aa size icr14250 3.7v 300mah li-ion lithium rechargeable battery?

Yes but 1.2k program resistor should be changed out for a 4k to match 300ma cc charging. Assuming 1C charging. May be able to push 2C with a 2kohm.

Will this charge a bank of 4 18650 batteries?

These are designed for single cells. One of these boards could charge 4 batteries in parallel at 1/4 the charge rate. If you want to charge 4 batteries in series you would need to use 4 of these boards, one for each battery, but it is not clear to me whether they could remain in the circuit while drawing power from the batteries or what the output would look like when one or more charging board was powered. Without more detail from the manufacturer, I would assume that it would not work for cells in series.

If i connect this to solar panels will this charge and run my nodemcu lua wifi ?

i’ve currently got two solar panels (5v) 300mah each one charging one 18650. you can use the outputs one to connect each other to get whatever voltage for example two 18650 is about 7-8v. i’m using dc buck converter to drop it to 5.2 in hops to run a raspberry pi4 which takes 5.2v@3. :)

Can it take in 3.7v and output 5v? Or would I need a step up module?

No. If you dropped the input voltage to 3.7v it would not draw enough current to charge the battery. You could step up the output voltage but it would stop changing when the cutoff voltage reached 4.2v.

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HiLetgo 10pcs 5V 1A 18650 Lithium Battery Charging Board TP4056 Lithium Battery Charging Board Micro USB Charge Module with Protect

HiLetgo 10pcs 5V 1A 18650 Lithium Battery Charging Board TP4056 Lithium Battery Charging Board Micro USB Charge Module with Protect

Product ID: 29055596

Details

Brand
HiLetgo
Color
red
Item Weight
22.68 g
Output Voltage
4.2
Product Dimensions
1.02"D x x

⚡5V input voltage

🔋1A max charge current

🛡️Built-in battery protection

¥2806

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Description

🔌 Power up your projects with precision and protection!

COMPACT DIY FRIENDLY - Slim 2.6 x 1.7 cm board fits perfectly into custom projects and quick battery swaps.
EFFORTLESS USB CHARGING - Micro USB female port for seamless plug-and-play with any phone charger.
OPTIMIZED POWER DELIVERY - Delivers a precise 1A charging current to safely and efficiently power your 18650 batteries.
SMART BATTERY PROTECTION - Integrated over-discharge and overcurrent safeguards keep your batteries safe and extend lifespan.
RELIABLE MULTI PACK VALUE - Set of 10 modules ensures you’re always ready to power up multiple devices or projects simultaneously.

The HiLetgo 10-pack 5V 1A 18650 Lithium Battery Charging Boards feature micro USB inputs for easy charging, deliver a stable 1A current with a 4.2V cut-off voltage, and include built-in protection against over-discharge and overcurrent. Compact and reliable, these modules are perfect for DIY enthusiasts and professionals needing efficient, safe battery charging solutions.

Specifications

ASIN	B00LTQU2RK
Amperage	1 A
Brand	HiLetgo
Color	red
Compatible Devices	Devices using 18650 lithium batteries with USB charging port
Connector Type Used on Cable	Micro USB (female)
Current Rating	1 A
Customer Reviews	4.6 4.6 out of 5 stars (628)
Input Voltage	5 volts
Item Dimensions D x W x H	1.02"D x 0.67"W x 1.02"H
Item Weight	22.68 g
Manufacturer	HiLetgo
Mfr Part Number	3-01-0205
Model Number	3-01-0205
Number of Items	10
Number of Packs	1
Number of Ports	10
Output Voltage	4.2 volts_of_direct_current
UPC	702082655146
Unit Count	10 Count

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¥2806

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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TrustScore 4.5 | 7,300+ reviews

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