Bicycle Headlight and taillight

I wanted a REALLY good lighting system for my bike and this collection of parts is quite unique. The Harbor Freight quad flood light is really bright, has the perfect pattern for use as a bike headlight, AND its really cheap! $21 at time of publishing. The tail lights and battery holder are from amazon and the prices on those won't break the bank either. Affiliate links for everything listed below. If there is interest I could put a simple schematic together as well, let me know. Aside from the battery protection circuit, which is really important as over discharging your expensive tool batteries is a great way to insure an early grave, all these bits work together because the input voltages on all three lights are 12-24VDC, perfect for an ~18-20VDC tool battery!  I did include a momentary switch for the taillights as you can select the flashing pattern you want anytime you want! I will add some links for video of what this looks like at night as well. You will want to set the protection circuit cut off limit to 16VDC with the re enable voltage set for 2V. These setting should work well for you. The battery holder I used will accept either DeWalt 20V or Hercules 18V batteries and I really like that aas I have both in the shop. I used JST connectors for the taillights and some waterproof automotive connectors for the headlight. They can easily be hardwired as well. The headlight does come with a waterproof connector and a pigtail as well. 

Here is what you will need:

https://www.harborfreight.com/3-in-led-flood-light-64322.html

Tail lights pair: 

https://amzn.to/3WuFadT

Battery protection board:

DC 12V-36V Voltage Protection Module Digital Low Voltage Protector

https://amzn.to/3MQbTay

Power Switch:

https://amzn.to/3WrryjP

SLIM20 Adapter for DEWALT OR Hercules 20V MAX Batteries

https://amzn.to/3WwPSk1