The rechargeable batteries are lead-lead dioxide UN200-12EX (12V200Ah/20hr) systems. The dilute sulfuric acid electrolyte is
absorbed by separators and thus immobilized. Should the battery be accidentally overcharged producing bydrogen and oxygen, Special
one-way valves allow the gases to escape thus avoiding excessive pressure build-up. Otherwise, the battery is completely sealed and is, therefore, maintenance-free, leak proof and usable in any position.