Dual cordless landline phone and answering machine

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Two Panasonic Panasonic KX-TG8120 digital DECT cordless handsets for landline phones. Includes digital answering machine. I haven't got a landline in my flat, but last time I used them they worked fine. The rechargeable batteries they came with originally have stopped working, so each phone will need 2x AAA NiMH rechargeable batteries, which are widely available (eg. http://www.amazon.co.uk/550mAh-NiMH-Rechargeable-Batteries-Pack/dp/B002WSP65W). The original set lasted for 5 years. Manual here: https://www.panasonicphones.co.uk/t/Manuals EC1 Goswell Road/Percival Street area.