Build your own custom battery pack with confidence using our premium selection of battery pack supplies and accessories. Whether you're assembling an 18650 pack for DIY electronics, power tools, EV projects, solar storage, or high-performance devices, we carry the essential parts you need to get the job done right.
Battery Building Supplies
Mini Spot Welder Machine DIY Kit 18650 Battery Spot Welding Pen Tools
$64.95 $57.95
Pre-Order Available 
Positive Tip Caps For 18650 Batteries (25 Pack)
$10.49 $0.42 /
Nickel Plated Strip Tape for 18650 Battery Pack Welding .1mm & Universal Use
$8.95 $0.02 / in
Popular 21700 Options
Take a look at what fits the job for most
Pre-Order Available 
21700 4000mAh Li-Ion Protected Battery - Universal Flat Top
$10.49 $10.49 /
Hohm Run XL 21700 4007mAh 30.3A Battery
$9.89 $9.89 / item
Certified Hohm Tech 18650 Batteries
Hohm Tech Life V4 18650 Battery 3.6v 3015mAh 22.1A
$9.95 $7.89 $7.89 / item
18650 Battery Flat Top 2547mAh 25.3A Battery Hohm Work
$6.79 $5.49 $5.49 / item
Hohm Alone 18650 Battery 3.7v 3309mAh 15.3A ICR
$12.49 $8.99 $8.99 / item
Hohm Tech Mega 3.6v 18650 Rechargeable Battery – 2505mAh, 22A High Drain Li-ion Flat Top
$12.99 $7.79 $7.79 / item
