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M18 18V Battery Rebuild Kit – 10‑Cell BMS, Nickel, Shell, Hardware (No Cells)
Regular price $19.99 USDRegular price -
2S 8.4V 20A BMS Board w/ Balance
Regular price $6.99 USDRegular price -
25,000mAh High-Capacity Power Bank – Dual USB + Wireless Charging, Removable 21700 Cells
Regular price From $33.96 USDRegular price -
12,000mAh Portable Power Bank – Dual USB QC Fast Charging + LCD Display
Regular price $19.34 USDRegular price -
High-Speed 10,000mAh Power Bank – USB-C PD + QC3.0, Wireless Charging & LCD Display
Regular price $18.55 USDRegular price -
Mini Tube Power Bank 2600mAh – USB Portable Charger Stick for Phones & Gadgets
Regular price $5.18 USDRegular price$9.99 USDSale price $5.18 USDSale -
XT60 13 Inch Extension for Rc Battery Charger 14Awg Silicone Wire Male to Female
Regular price $9.99 USDRegular price -
High-Capacity 50,000mAh Power Bank – USB-C PD 22.5W Fast Charge + 15W Wireless Qi
Regular price $45.36 USDRegular price -
50× Pure Nickel Strips 0.2×10×100 mm – Pre-Cut for Battery Pack Spot Welding
Regular price $4.95 USDRegular price -
8x BAK 18650 2600mAh 3.7V Li-ion Batteries with Clear Plastic Case – New
Regular price $22.99 USDRegular price -
8x Samsung 25R 18650 2500mAh 20A Flat Top Li-ion Batteries + Case – Authentic
Regular price $32.99 USDRegular price -
2 x Molicel P42A 21700 4200mAh 45A Rechargeable Battery Cell + Case - Authentic
Regular price $9.95 USDRegular price -
Battery Storage Case for 2x 18650 / 18500 / 18350 / CR123A – Clear Holder Box
Regular price $6.99 USDRegular price -
Enerkey 2S 30A 7.4V–8.4V Lithium Battery BMS Protection Board for 18650/21700 Packs
Regular price $6.58 USDRegular price -
2 Rolls 10mm x 33m (108ft) Heat Resistant Polyimide Tape – High Temp Kapton Adhesive for Electronics, Soldering, Sublimation & Circuit Boards
Regular price $9.99 USDRegular price -
XT30 Connectors & Pre‑Wired Female Plug with 18AWG Wire (10–15cm)
Regular price From $1.49 USDRegular price
Rebuilding Power with Precision
Watch a DeWalt 20 V battery pack rebuilt using the same premium pre-cut nickel strips available at RenewSpark.
Shop Pre-Cut Nickel Strips →Collections
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18650 Cells
Shop high-performance 18650 lithium-ion cells for DIY battery builds, power tools, e-bikes,...
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21700 Cells
Browse premium 21700 lithium-ion cells designed for higher capacity and power output....
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Connectors & Contacts
Find high-quality connectors, terminals, and contacts designed for secure and reliable battery...
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Power Bank Cases
Keep your devices powered and protected with our durable power bank cases....
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Nickel Strips & Fish Paper
Nickel Strips & Fish Paper – Reliable Battery Building Materials Discover high-quality...
Blog – Battery Tips & Guides
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5S2P (18V) Power Tool Batteries: Why Every Bran...
Why do DeWalt, Makita, and Snap-on rely on the 18V 5S2P layout? Because it balances voltage, current, weight, and runtime. Here’s why 5S2P dominates—and how a professional rebuild can bring...
5S2P (18V) Power Tool Batteries: Why Every Bran...
Why do DeWalt, Makita, and Snap-on rely on the 18V 5S2P layout? Because it balances voltage, current, weight, and runtime. Here’s why 5S2P dominates—and how a professional rebuild can bring...
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21700 vs 18650 Batteries: Key Differences, Adva...
By RenewSpark • Updated: September 6, 2025 Wondering whether to choose 21700 or 18650 cells for your next project? Both are widely used lithium-ion formats—but they serve different needs. In...
21700 vs 18650 Batteries: Key Differences, Adva...
By RenewSpark • Updated: September 6, 2025 Wondering whether to choose 21700 or 18650 cells for your next project? Both are widely used lithium-ion formats—but they serve different needs. In...
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How to Build a 2S2P 7.4V 21700 Li-ion Battery P...
DIY step-by-step tutorial to build a powerful 2S2P 7.4V 21700 Li-ion battery pack with a 30A BMS and XT60 connector. Includes parts, tools, wiring instructions, and safety notes.
How to Build a 2S2P 7.4V 21700 Li-ion Battery P...
DIY step-by-step tutorial to build a powerful 2S2P 7.4V 21700 Li-ion battery pack with a 30A BMS and XT60 connector. Includes parts, tools, wiring instructions, and safety notes.
Recycling Program – Trade In & Earn Credit
Mail us your dead batteries — recycle responsibly and earn store credit toward your next purchase.
