Cheapest it has been on Amazon. Got the Hybrid version of this, an excellent trimmer, battery life is about 20-25 minutes. But can get 4.0 ah or 5.0 ah batteries which are worth buying imho if you have other tools in the range like the hedgecutter etc and last about 50-60 minutes
This comes with a 1.3 ah battery and charger, very lightweight and charge time is about an 45 minutes with the charger supplied.
The Ryobi RLT1825LI 18 V Li-Ion Line Trimmer Kit (1x1.3 Ah battery) is both lightweight and durable.
1 x Ryobi 18V OnePlus Li-Ion Line Trimmer
1 x 1 x 18V compact Lithium-Ion battery
1 x charger