DEI

Repurposing a Ni-Cd Charger for Li-Ion Batteries

(Maker-Fixer Edition)

Your old Ni-Cd charger can live again. It’s got the guts — transformer, rectifier, and housing — it just needs brains. We’ll keep the power section and add modern control so it can safely charge Li-ion tool packs or custom builds.

What You’ll Need

• Your Ni-Cd charger (rated 9.6 – 18 V output)
• One DC-DC buck converter (example: LM2596 module)
• One BMS board (Battery Management System) for your cell count
• 1S = 4.2 V cutoff
• 2S = 8.4 V cutoff
• 3S = 12.6 V cutoff
• 4S = 16.8 V cutoff
• Connectors (XT60 or barrel plug)
• A bit of 14–18 AWG silicone wire
• Optional: heatsink or small printed enclosure

How It Works

1. The Ni-Cd charger becomes your DC power supply. It no longer controls charging — it just provides raw DC voltage.
2. The buck converter trims that voltage to the exact target for your Li-ion pack (4.2 V per cell × number of cells).
3. The BMS board connects directly to the battery pack and handles all the smart stuff — balancing, over-current, and full-charge cutoff.

Example:

If you’re charging a 3-cell (3S) Li-ion pack, set the buck converter to 12.6 V output.

For a 4-cell (4S) pack, set it to 16.8 V.

Wiring Sequence

Ni-Cd charger (+) → input of buck converter

Ni-Cd charger (–) → input of buck converter

Buck converter output (+) → BMS “B+”

Buck converter output (–) → BMS “B–”

Battery pack wires → BMS board according to your cell count (B1, B2, B3, etc.)

Your tool or device connects to the BMS “P+” and “P–” pads.

Optional Add-Ons

• Use a small voltmeter display on the output so you can quickly confirm charging voltage.
• Keep the original LED on the Ni-Cd charger housing and rewire it to the BMS “charge complete” or power LED if you like indicators.
• You can even add a small 12 V fan to the case if you plan on charging large packs.

Typical Part Sources

• LM2596 buck converter module – a couple bucks online
• 3S/4S BMS board – about five bucks
• XT60 connectors – a few dollars for a pack
• Heat shrink and wire – grab a cheap silicone kit

Summary

Your Ni-Cd charger’s job now is simple: be the power brick.

The buck converter and BMS do the thinking.

No more junk drawer electronics — just a solid, functional Li-ion charger that fits in your maker space.

router setup

• Dell router with UFW firewall, DHCP, NAT, Nginx reverse proxy

• Nginx on Dell proxying localad.us and photola.us to Apache

The global elite learned a long time ago that real control doesn’t come from force… it comes from fatigue. Make people tired, sick, and hopeless, and they’ll pretty much do whatever you want.

setup dell optiplex 6th gen intel pc as a router, created this admin panel in claud.ai super clean

Server setup with static ip

Plan:

1. Install Nginx on Dell as reverse proxy

2. Configure virtual hosts in Apache (iMac) for 10 domains

3. Point all 10 domains to your static IP via DNS

4. Route traffic through Dell to Apache by hostname

5. Create separate endpoint for AI service (auth-protected)

6. Set firewall rules on Dell to allow only necessary ports

doing inside cuts