Odyssey batteries are great but no idea how you would get them approved in EASA land. Pretty common down south under approved design organisation EO.
Commercial dry cell sealed batteries. Apart from a scheduled in situ visual inspection no maintenance required. Occasional top up charge and at least two years service is normal. Only a few hundred $ a pop.
Used them in the bush on 500's/206L4's/AS350's and my fuzzy memory recalls seeing a set up on a Lama replacing the NiCad bank!
Hughes500
Your kool spool will have Odyssey or similar. Streets ahead of "OEM approved" batteries for aircraft installations
Last edited by Salusa; 25th Aug 2015 at 14:13.
Reason: reply to Hughes500