In the rapidly growing world of diving sports and underwater exploration,underwater scooters have become increasingly popular as an eco-friendly and quiet power option. The safety of lithium batteries, which power water sportsequipment, is now a top priority for users.

Since its launching in 2022, the SUBLUE Gray Battery has proven to be a reliable safeguard for enhancing the safe experience of underwater scooters, providing energy solutions for products like Navbow, Swii, Tini, and Vapor.

SUBLUE batteries have been optimized for R&D innovation, production control, and quality inspection. This focus on safety and reliability has set new standards for underwater energy sources, ensuring rigorous safety requirements are met.

R&D
Logic: Safety First, Driven by User Needs

"As the pioneer of portable underwater scooters, while providing global users with joyful experiences in water sports, safety is always our top priority," Yan, SUBLUE Product Manager.

When developing underwater scooter products, SUBLUE thoroughly researches user needs, diving deep into user experience and operational   safety to improve their designs. The research and investment in batteries powering these underwater scooters are even more critical in their daily work.

Typically, batteries generate heat during charging and discharging, and excessive heat can affect lifespan and safety. SUBLUE has partnered with top global battery cell suppliers to optimize BMS circuit design and core component selection. This prevents batteries from heating up too quickly or overheating, avoiding battery-induced fires and extending battery life.

When batteries are stored for long periods without use, their power gradually decreases. Failing to recharge a battery before it's overly discharged can lead to permanent damage. SUBLUE has optimized the BMS intelligent algorithm to significantly reduce self-discharge current, preventing battery swelling or irreversible capacity reduction due to over-discharge.

"We've also implemented multiple protection mechanisms, setting overcharge, over-discharge, over-temperature, short circuit, overcurrent, and other protection parameters to two decimal places for millisecond-level fault response, ensuring user safety from all angles," emphasized Yan, SUBLUE Product Manager.

The R&D team starts with real user scenarios to construct the battery's core design, with timely response user concerns driving product improvements. 

Production Site: Fine-Tuning Process Details with a "Microscope Mentality"

SUBLUE sees the production stage as the key to quality control, ensuring product consistency through process upgrades and reengineering. 

Battery pack performance often hinges on the quality of individual cells. SUBLUE uses high-precision sorting equipment to screen each battery cell's voltage and internal resistance rigorously. This ensures that voltage differences within the battery pack are ≤3mV and internal resistance differences are ≤3mΩ, eliminating performance risks at the source and boosting overall battery pack stability.

Deep diving environments require top-notch battery sealing. SUBLUE tackles this with a "double sealing" process. First, they use ultrasonic welding to achieve a "zero gap" seal where the battery case connects, physically eliminating gaps and blocking environmental interference. Then, they inject high-performance insulating potting glue to fill internal gaps, creating a second barrier. The technology enhances shock and moisture resistance without compromising thermal performance, ensuring the battery operates reliably under 50 meters of water pressure.

Production Supervisor Baoshuai deeply understands the critical points and data in the production process, thanks to SUBLUE's MES full-process tracking system. "MES tracks each batch of materials from raw components to finished batteries," he explains. "This ensures traceability at every stage and strict quality control, maintaining consistent product quality."

Quality Inspection System: Extreme Testing for Enhanced ProductReliability

Before batteries leave the factory, they go through many tests, including functional, safety performance, and seal tests. SUBLUE has set up a two-tier quality inspection system that combines lab and production line tests to verify product reliability way beyond industry standards.

Quality Manager Jie explains, "We've simulated almost every scenario users might encounter with underwater thrusters. We put our batteries through the wringer with extreme environmental tests like high and low-temperature cycling, vibration impact, and salt spray corrosion to ensure they're stable in tough operating conditions."

To ensure every battery performs like a champ in harsh environments, SUBLUE has developed its own set of tools for double-checking everything. They simulate deep-sea pressure with a 50-meter water pressure test, putting the battery through its paces for an extended period to guarantee zero leaks. They use a differential pressure tester on 100% of finished products for airtightness, catching even the tiniest leaks you can't see with the naked eye.

Since founding in 2013, SUBLUE has spent eleven years fine-tuning its tech and products. They've always put user safety first. This obsession with safety isn't just about tweaking technical specs - it's about innovating the whole chain from R&D philosophy to production. That may be why they won the trust of users worldwide. With its no-compromise attitude, SUBLUE raises the bar for underwater thruster safety standards, ensuring every underwater adventure is worry-free.

Introducing SUBLUE Batteries: How Our Batteries Enhance Safety for Underwater Exploration