VRLA, Li-ion and NiMH: comparison among different batteries for DPV

batterie dpv

The underwater scooters DPV exploit electric propulsion for their motion: this, zeroing the impact for the environment and sensibly reducing the noise emission, makes the DPV usable respectfully into wild parks and protected areas. 

Similarly to any other modern electric vehicle the key element for the underwater scooter is the battery efficiency, its performance in accumulate the energy during the charging phase and then to release for the feeding of the electric propulsions and other on- board systems.

More than one kind of battery do exist and the different constitutive compounds and the chemical reactions exploited confer to each type the distinctive performance and behaviour.

In our underwater scooter batteries from three technology kinds are in use: the lead acid (VRLA), the Lithium –ion  (Li-ion) and the Nickel-Metal-Hydride (Ni-MH)

The VRLA batteries exploits cells made by led plates immersed into a gel electrolite solution; internal safety valves moderates against the excessive development of gas during the chemical reactions.

This kind of batteries offers many advantages, among which the almost null need for maintenance, their high mechanical robustness and their suitability for low and high ambient pressure that makes them compatible for either the underwater use and the air transport.

In any case, due to the possibility to develop some hydrogen gas, these batteries requires diligent attention during the re-charging process and the safety instructions be observed.

The 7Seven model uses VRLA battery pack.

The Li-ION batteries exploits the arrangement of the two different materials for cathode and anode, respectively Lithium compound and carbon, immersed into a lithium-based electrolyte solution to for Lithium-ions flowing in one or the opposite direction during the charging and discharging phases of the working cycle.

High energy density is typical for this kind of batteries and this this makes possible to accumulate more energy into the same volume of space, in comparison with other technologies. Also the very low self-discharging rate and the minimal memory effect (=reduced availability of the stored energy in case a not-fully-discharged battery is charged) are favourable characteristics.

However, due to the specific chemical reaction – that represent hazard for fire or explosion in case of damage – international standards put limitations for the air transport of the Lithium-ion batteries.

The VRX, XJS and XK models use Li-ion batteries.

The Ni-MH batteries include cells with Nickel cathode and Hydrogen adsorbing alloy anode immersed into alkaline electrolyte solution establishing a Hydrogen ions bi-directional flow of during charging and discharging phases.

The Ni-MH batteries show high energy density – although inferior to the Li-ion – small self-discharging rate and some small memory effect. The latter minor cons can be minimized by opportune fully charge/discharge during usage while their chemical characteristic lets these battery being transported by air without any restriction.

The XJT and VRT models uses Ni-MH batteries.

Explore all our underwater scooter features.

PROP LOCK
Patented by SUEX, it is the only propeller that can be disassebled underwater by hands, without any tools.
The propeller can be disassembled anytime acting on the locking knob, realized in white colour for the best visibility underwater.
As for any other SUEX propeller, it integrates and includes a safety clutch device, playing important role in case of obstructions.
Thanks to the shielded gasket solution the propeller diassembly does not impact the main shaft sealing.

PROPELLER
Made by carbon fibres reinforced techno polymer

SPEED CONTROL SEVEN VR
2 speed rates pre-set at the factory: one ideal for cruise and one at the max  power.

SPEED CONTROL XK-XJ
It allows the speed adjustment from 0 to 100% of the range.
By single action on the trigger the pre-set or the maximum speed can be selected.

ACCELERATION RAMP
Every model