Annapurna Base Camp is a Grade B or a moderately difficult trekking route. So any fit person can do this trek, even if you do not have any previous experience. You should be aware of what to expect and mentally prepare for it. Then, as long as you will to, you can.

On average, you walk about 4 to 6 hours per day. One or two days can be as less as 3hrs and one or two days can be as long as 7hrs.

The highest altitude reached is 4190m. This is the elevation of Annapurna Base Camp. ABC is the highest we will climb in this trek.

Yes, you can charge batteries en route. Charger should be brought. There are hot shower facilities as well. You may have to pay certain amount for both ($1-$2). Negotiate. Also, hot water facility could be free at lower elevation.

No. There are no ATMs on this trek route. You will have to draw enough cash in Pokhara or Kathmandu. There are a number of ATMs in these cities. Everything is paid in Nepali rupees. So money should be exchanged before the start of the trek.