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  Hartenberger Unterwassertechnische Geräte GmbH - The specialist for underwater lights
Hartenberger High-Tech-lamps "mega compact" - "mega compact D2"
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mega compact and
mega compact D2 (HID)

Optional we offer Lithium-Manganese-Cells.

Since 2003 we took receipt of a newly developed
re-chargeable cell for test purposes, a
lithium- manganese- cell. The electrode material is manganese sealed in a so called spinell rather than the traditional cobalt electrode.
The cells have proven themselves to be the
"wonder cells" with the following properties:
Excellent power properties and resilience
Low self discharge, less than 2% per Month
At temperatures as low as -15°C (+5°F), the cells retain 95% capacity
A missing (defective) protection switch within the cell will reduce the capacity of the cell but will not produce an explosive reaction such as those previously mentioned in lithium ionen cells.


Mechanical damage such as a blow or squeezing, or even a puncture of the wall of the cell such as with a nail will not produce a critical chemical reaction within the cell.
For fully charged cells at high ambient temperatures, the aging process of these cells is considerably less than that in lithium ionen cells. Another feature that must be mentioned is that aged lithium manganese cells do not produce dangerous hydrogen gas and therefore make re-charging in a sealed housing much safer and in our opinion only now possible.
The only disadvantage of the lithium manganese cells is that the energy density is approx 10% less than lithium ionen cells. Compared to the nickel metal hydride cells, the lithium manganese cells have 30% higher energy density