Thanks Wissy.
Motor type - brushless pedal bearing motor - power output 250 watts
Battery - Lithium ion manganese 26V 10 Ah (260Wh)
Service life 500 charging cycles.
Charging time 3 hours
Gears-7 ( I have used it many times without power and it's perfectly rideable but a bit heavy up hills for my legs
On longer rides I would just turn on the power up hills.
I haven't used the bike for over a year until last week. I took it for a 15 mile ride on after fully charging. There are three power settings on the bike and I used the middle one for the whole trip and it had 2 lights out of five left on the battery when I put it on charge. I then did a 12 mile (hilly) trip yesterday on the lowest power setting and it had 3 lights out of five remaining. This isn't significantly less than when new. So I would say there is still plenty of life left in the battery. However, you are right, a replacement battery should be factored in within the next couple of years (or if an upgrade for longer range is needed). I've done just over 1100 miles (there is a bike computer with it) Say an average of 10 miles per trip = 110 charges out of an expected life of 500. Also, there is probably a time factor but the battery has a sleep facility so I don't think it has degraded much based on current performance.
By the way I haven't had a singe fault with the bike, which is testament to the quality.
Menai is on the other side of the island to me (Valley)