Lithium battery types covered by this Guide include lithium-ion@ lithium-alloy@ lithium metal@ and lithium polymer types. For requirements related to conventional battery types@ please refer to 4-8-3/5.9 of the Steel Vessel Rules or 4-3-3/3.7 of the MODU Rules. For requirements related to the use of batteries in underwater vehicles@ please refer to Subsection 10/11 of the ABS Rules for Building and Classing Underwater Vehicles@ Systems and Hyperbaric Facilities. Battery technology is a field that is continuously evolving with respect to battery chemistries and designs. Alternative battery technologies and arrangements may be considered provided it can be shown@ through either satisfactory service experience or a systematic analysis based on sound engineering principles@ to meet the overall safety standards of this Guide and the ABS Rules.