Build Battery Packs

Cells

• DIY500AMP.COM
• Order #1584 2025-09-25

• Ampace JP40 "LT Wrap" 21700 4000mah 70A Battery - Tabless Cell × 120
• Subtotal $474.00 Shipping $22.99 Total $496.99 USD

Order #3924 2026-09-09

Ampace JP40 "LT Wrap" 21700 4000mah 70A Battery - Tabless Cell × 1 FEB 21700 Battery Cell – 6500mAh 13A Ultra High Capacity Energy Cell × 30

$224.70

Welder

• Heltec HT-SW02H
• Manual
• Order #114-4340207-9060214 2025-10-30
• Spot Welder & Milliohm Meter
• 42 KW 7000A Capacitor Energy Storage Pulse Welding Machine
• Subtotal $729.90 Tax: $43.79 Total: $773.69

Battery Case

• 15 cell m18 kit (8 batteries)
• $389.20

Cost

• Me: $497+$774+$390=$1660
• Milwaukee (with worse cells): $279*8=$2232

Extra

• Balancer: 2A Active Balancer 2S–24S with Built-in Bluetooth RS485 and Temp Sensor for LiFePO4 Li-ion LTO 20V–100V Smart Equalizer Module (JK-DZ11-B2A24S)
  • COM protocol
• HD26 connectors:
  • male CN-DSUBHD26PN-000
  • female CN-DSUBHD26SK-000
  • 20 wire ribbon 28AWG

Assembly

• Pictures

DIY Charger

STL for receptical Build a better..