The iDect X3 phone and X3i phone came with genuine Sanik NI-MH batteries in. These are the original 2SN-3/5F60H-H-JP2 2.4V 600mAh rechargeable batteries. You can tell how old your existing battery is by looking at the production date code on the battery. After the word Sanik, there is a four digit code. The first two digits are the year the battery was made, the second two digits are the week of that year. So, 0710 for example, would have been manufactured in the 7th week of 2007.
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