We specialize in battery rebuilds, lithium cells, and DIY parts for power tools, e-bikes/scooters, flashlights, and custom projects. Our goal is to help you save money, extend equipment life, and reduce electronic waste.

All loose lithium cells we sell are brand-new authentic cells from trusted suppliers. For rebuild services, we install new, high-quality cells into your existing battery housing. We do not resell used or unsafe cells.

We remove the worn cells from your pack and replace them with fresh, high-performance cells, then reassemble and test. You get near-new performance at a fraction of the cost of buying a new pack—while keeping plastic housings out of landfills.

In-stock items ship in 1–2 business days from California. Typical U.S. delivery is 3–5 business days via USPS Ground Advantage. You’ll receive a tracking number once your order ships.

Yes. Orders $20+ ship free via Standard Shipping. Orders under $20 ship for a simple $3.95 flat rate.

Not yet. Due to lithium shipping regulations, we currently ship within the United States only.

Unused, unopened items may be returned within 30 days of delivery. Contact support@renewspark.com for an RMA and instructions. Please keep packaging and your order number handy.

Yes—our rebuild services include a 90-day limited warranty covering workmanship and cell performance under normal use. Physical damage, misuse, water ingress, and modifications are not covered.

Snap a few photos of the packaging and item, then email support@renewspark.com with your order number. We’ll take care of you with a replacement or refund.

Yes—nickel strip, BMS boards, battery cases, holders, and more for hobbyists and repair techs.

Our parts are tested, but lithium cells require careful handling. Always use proper tools, follow manufacturer specs, and wear eye/hand protection. If you’re unsure, choose our rebuild service.

Safety Never short-circuit cells, overcharge, puncture, or leave packs unattended while charging.

We’re happy to answer product questions. We don’t offer step-by-step engineering for custom projects, but we’ll point you to the right parts.

Rebuilds extend pack life and keep housings out of landfills. Supplying DIY parts supports repair culture and a circular economy—renew, rebuild, reuse.

Yes—we responsibly recycle worn cells through approved programs in the U.S.

Email support@renewspark.com or use the chat on our site. We typically reply within 1 business day.