How do I connect these for 24 volts using 14 18650 batteries? 7 in series, 2 groups in parallel.

I recommend to use 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board Know as a BMS. search for DIY 18650 battery pack

What is the max input voltage? Would 5v be ok

5v input should be fine. The battery will be allowed to charge till a battery measure of 4.25 is reached, then the circuit will disconnect your 5v input from the battery.

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10pcs 3A BMS Protection Board for 1S 3.7V 18650 Li-ion Battery | Solder Belt,Silk-Screened PCB Labels (B+,B-,P+,P-),for Building Custom Battery Packs Garden Solar Lights and on-the-go Power

Product ID: 166027929

Details

Brand
KOOBOOK
Color
Green
Input Voltage
3.7 volts
Item Weight
0.01 kg
Output Voltage
3.7 volts

⚡2A continuous current limit

🔋4.2V precise charging voltage

🛡️Multi-layer battery protection

€ 14.64

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Build smarter, power safer — never miss a charge!

COMPACT VERSATILE - Slim 30x3.7x2.2mm PCB fits seamlessly into custom 1S 18650 battery builds.
POWER WITH PRECISION - Engineered for exact 4.2V charging to maximize battery life and performance.
SAFETY FIRST ALWAYS - Integrated overcharge, overdischarge, short circuit, and overcurrent protections keep your battery pack secure.
PLUG PLAY CONFIDENCE - Silk-screened PCB labels (B+, B-, P+, P-) ensure foolproof wiring every time.
BULK READY FOR BUILDERS - Pack of 10 boards to power up multiple projects or scale your solar and portable power solutions.

The KOOBOOK 10pcs 3A BMS Protection Board is a compact, reliable battery management system designed for 1S 3.7V 18650 Li-ion batteries. Featuring precise 4.2V charging, 2A continuous current handling, and comprehensive safety protections including overcharge, overdischarge, short circuit, and overcurrent safeguards, it ensures optimal battery performance and longevity. Ideal for custom battery packs in garden solar lights and portable power devices, this set of 10 boards comes with clear silk-screened PCB labels for easy installation and stable, low current consumption operation.

Specifications

ASIN	B07W75BQWW
Best Sellers Rank	#53,670 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #37 in Lab Power Supplies #71 in Life Science Supplies
Brand	KOOBOOK
Color	Green
Customer Reviews	4.4 4.4 out of 5 stars (150)
Input Voltage	3.7 volts
Item Weight	0.01 kg
Manufacturer	KOOBOOK
Mfr Part Number	KB457
Model Number	KB457
Number of Items	10
Number of Outlets	10
Output Voltage	3.7 volts
Plug Type	Type A
Power Source	rechargeable battery
UPC	797805999058
Unit Count	10 Count

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