Home workshop tool designed for battery pack builders, the Seesii Battery Spot Welder combines power supply and welding pen into one handheld unit to simplify assembly and small repairs. Comfortable one-handed operation and a rechargeable battery remove much of the fiddliness from pack-building. Is the design robust enough for repeated use and safe for DIY battery work?
⚡ At a Glance
- • Welding Performance: 80 adjustable power levels with dual pulse output for controlled heat during joins
- • Best for: Hobbyists and technicians assembling cylindrical cells and small battery packs
- • Not ideal for: High-volume industrial production where bench-top welders are preferred
Handheld unit supports precise control via adjustable power and dual modes. Digital readout and safety protections help manage welding tasks reliably.
Consistent, neat welds – thanks to 80 adjustable power levels and dual pulse output
Dual pulse output and 80 power settings allow heat and energy per weld to be fine-tuned, reducing burn-through on thin materials. Pulse control shortens the weld time while delivering repeatable energy to nickel strips of 0.1–0.2mm thickness.
Repeatable joins make pack assembly faster and reduce scrap when working with 18650, 26650 or 32650 cells and battery tabs.
True portability – with integrated power supply and 5.0Ah Type-C rechargeable battery
Integrated design combines the power supply and welding pen so there is no separate external box to carry. A 5000mAh battery delivers up to 800A peak output and supports more than 800 welds per full charge, with convenient Type-C charging.
Ability to weld away from a bench suits field repairs, mobile work or workshops lacking fixed equipment, while long runtime reduces interruptions.
Clear control and safer workflows – with OLED display and built-in protections
OLED colour display shows real-time mode, power level, preheat status, time delay and welding progress. Onboard protections guard against low voltage, overcurrent and overcharge and high-temperature resistant wires add reliability under load.
Visible settings and safety cut-offs help prevent user error and protect cells during repetitive pack assembly.
✨ The 4 Key Reasons for Seesii Battery Spot Welder
- Integrated handheld design – Eliminates external pen and simplifies one-handed welding
- Long-run 5,000mAh battery – Enables hundreds of welds without frequent recharging
- OLED colour display – Shows power, preheat and progress for confident adjustments
- Comfortable, well-built grip – Reduces fatigue during longer battery-pack builds
📋 Technical Details at a Glance
- Category: Home Improvement / Battery Spot Welder
- Supported Cells: 18650, 26650, 32650 and similar cylindrical lithium cells
- Welding Materials: Nickel-plated sheets 0.1–0.2mm, iron, stainless steel sheets
- Power Levels: 80 adjustable levels
- Output Current: Up to 800A max output
❓ Frequently Asked Questions
Q: Can the welder join standard 18650 cells?
A: Yes. The unit supports 18650 cells as well as 26650 and 32650 cylindrical lithium batteries, plus small mobile phone batteries.
Q: How many welds can be expected from a full charge?
A: A full 5.0Ah charge delivers over 800 welds according to the manufacturer description.
Q: Are there safety features built in?
A: Yes. The system includes protection against low voltage, overcurrent and overcharge, and uses high-temperature resistant wires for safer operation.
🏆 Our Verdict
Suitable for hobbyists, technicians and small workshop users who build or repair battery packs. Integrated handheld design, long-lasting 5.0Ah battery and OLED controls make repeatable, safe welds straightforward. Durable construction and practical runtime give reliable long-term value for frequent pack-building tasks.
