AMC1 SPO.IDE.A.190 Emergency locator transmitter (ELT)
BATTERIES
(a) All batteries used in ELTs or PLBs should be replaced (or recharged, if the battery is rechargeable) when the equipment has been in use for more than 1 cumulative hour or in the following cases:
(1) Batteries specifically designed for use in ELTs and having an airworthiness release certificate (EASA Form 1 or equivalent) should be replaced (or recharged, if the battery is rechargeable) before the end of their useful life in accordance with the maintenance instructions applicable to the ELT.
(2) Standard batteries manufactured in accordance with an industry standard and not having an airworthiness release certificate (EASA Form 1 or equivalent), when used in ELTs should be replaced (or recharged, if the battery is rechargeable) when 50 % of their useful life (or for rechargeable, 50 % of their useful life of charge), as established by the battery manufacturer, has expired.
(3) All batteries used in PLBs should be replaced (or recharged, if the battery is rechargeable) when 50 % of their useful life (or for rechargeable, 50 % of their useful life of charge), as established by the battery manufacturer, has expired.
(4) The battery useful life (or useful life of charge) criteria in (1),(2) and (3) do not apply to batteries (such as water-activated batteries) that are essentially unaffected during probable storage intervals.
(b) The new expiry date for a replaced (or recharged) battery should be legibly marked on the outside of the equipment.
Here's a 50-word summary, optimized for search: EASA ELT Battery Regulations: Emergency locator transmitter (ELT) batteries must be replaced or recharged after one hour of cumulative use. Batteries with airworthiness certificates must be replaced before expiry. Standard batteries or personal locator beacon (PLB) batteries require replacement at 50% of their useful life. Mark the new expiry date clearly.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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