Ericsson F251m User Manual page 44

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The FCT offers different optional alternatives for back up
systems:
• Rechargeable lead-acid batteries: 6V, 1.2-1.3Ah with 2.5
hours-continuous conversation, 10 hours stand-by.
• Alkaline AA batteries. In order to adjust 6 alkaline
batteries sized AA inside the terminal, an accessory AA
batteries holder (size: 99.01mm X 51.69mm) is provided.
• DC/DC power adapter: it is provided in order to use the
DC voltage (car battery, solar cell, etc.) to feed the FCT.
DC input: 12-24 VDC.
Due to the standard nature of these batteries, they are not
supplied by Ericsson.
No NiMH or NiCd rechargeable batteries are allowed.
Warning!: Ericsson recommends precaution when handling
lead-acid batteries and also special attention over storage and
power loss issues. See Safe and Efficient Use on page 57