14.8V 10Ah IP68 Underwater Scooter Battery Pack — Dual-Motor 800–1000W Continuous | OEM Wholesale

Q1: This pack is rated 14.8V while some competing replacement packs are listed at 14.4V. What is the practical difference for the Yamaha Seawing II and Robosea Seaflyer?

The Yamaha Seawing II and Robosea Seaflyer both use 4S Li-ion OEM batteries with a 14.8V nominal specification — the standard nominal voltage for a 4-cell Li-ion series configuration at approximately 50% state of charge. Packs listed at 14.4V describe the same 4S cell configuration using a lower resting voltage convention; the electrical operating range across charge and discharge is identical. The practical difference is documentation and certification alignment: if your product specification sheet, CE technical file, or platform service manual references a 14.8V battery, using a pack with a 14.8V nominal rating eliminates a discrepancy that can create questions during regulatory review or warranty assessment. For OEM programs where downstream certification documentation matters, nominal voltage match to the platform OEM specification is worth specifying explicitly.

Q2: How does the cell-level FUSE architecture interact with the Japanese IC BMS — do they create any conflict in normal operation?

The two protection tiers operate independently and in sequence, not in conflict. The cell-level fusible link is a passive, one-time-operation device — a thin conductor in the cell interconnect that opens irreversibly under the specific current magnitude of a hard short circuit at that cell. It does not activate under normal discharge current, charge current, or the transient current spikes that occur during motor startup. The Japanese IC BMS handles all normal operational protection — overcharge cutoff, overdischarge cutoff, overcurrent at pack level, overtemperature, and soft short circuit — through active switching on a continuous monitoring cycle. In normal operation the fuse is never triggered. In a hard cell-level short fault, the fuse opens first in microseconds; the BMS detects the resulting pack-level anomaly and responds in its normal protection sequence afterward. The two tiers complement rather than interfere with each other.

Q3: What needs to be confirmed for Yamaha Seawing II and Robosea Seaflyer compatibility, and what is the minimum order quantity?

Voltage at 14.8V nominal matches both platform OEM specifications. Physical compatibility confirmation requires the battery bay outer dimensions and connector interface type and pin assignment for each platform — these are fixed by the chassis and cannot be assumed from voltage alone. For buyers integrating into either the Seawing II or Seaflyer, send us the OEM battery dimensions or battery bay drawing and the connector spec at inquiry stage, and we confirm dimensional and connector fit before prototype commitment. Prototype validation orders using existing enclosure tooling proceed at 10 to 20 units. Full OEM customization — voltage, capacity, declared waterproof depth and duration, enclosure dimensions, and connector — is available. Technical proposal with pricing and lead time returned within 48 hours.

Q4: How does underwater hot-swap work at 50–60 meters depth, and what connector interface is used?

At 50–60 meters, ambient water pressure is approximately 5–6 bar. Underwater hot-swap at this depth requires a wet-mate connector — a connector type specifically rated for make-and-break operations while both connector halves are under pressure, with sealed pin and socket housings that exclude water from the electrical contact area during the connect and disconnect sequence. The connector mating force and seal geometry are engineered for operation at depth, not just surface-level water exposure. The default connector on this pack supports wet-mate operation at the declared depth rating. If your platform or operational protocol uses a specific wet-mate connector standard — SubConn, Cobalt, or a proprietary interface — specify the connector type, pin count, and pin assignment at inquiry stage and we configure the pack to match.

Q5: What are the storage recommendations for this pack between operational seasons, and does the FUSE architecture affect storage behavior?

Store the pack at 40–60% state of charge — approximately 15.2V to 15.8V on the pack terminals — for periods exceeding 30 days. Full-charge storage at 16.8V accelerates electrolyte oxidation at the cathode interface; full-discharge storage risks copper dissolution at the anode if pack voltage drops below the BMS undervoltage cutoff threshold during self-discharge over an extended storage period. The cell-level fuse elements are passive conductors in the cell interconnect and do not affect self-discharge rate, storage behavior, or capacity retention — they are mechanically inert until a hard short-circuit current event occurs. For storage exceeding 6 months, a single charge-discharge cycle to verify capacity before returning to active operational use is standard practice.

Q6: What freight documentation is included, and how does UN38.3 certification apply to the 148Wh energy rating for air freight?

UN38.3 transport certification is included as standard with all shipments and covers the required testing series for lithium battery classification under IATA Dangerous Goods Regulations, IMDG Code, and ADR/RID. For air freight, a 148Wh Li-ion pack falls above the 100Wh per-cell threshold that defines Section II treatment under IATA PI 965/966/967, placing the shipment in the Class 9 dangerous goods category requiring explicit carrier pre-approval, state of charge restriction to maximum 30% for cargo aircraft, and full dangerous goods documentation. The UN38.3 certificate is the primary document your freight forwarder needs to initiate carrier approval. We supply the certificate, Safety Data Sheet, and material declaration documentation with every shipment. CE and RoHS certification are available separately for European market product registration.