The batteries are quite spectacular, I have a husaberg TE300 2-stroke which i use up in the mountains around Cape Town, from new the battery never had enough oomph to swing the starter motor the bike lived on the trickle charger permanently, since installing the 8 cell ballistic the bike starts every-time i dropped 3 kilos on the weight and no trickle charger.
For the HP2's they are a no brainer as you can see they are geared up for travelling africa and a battery failure somewhere in Zambia or Mozambique is just not an option.
As i understand it the batteries are also environmentally friendly if that makes a difference to you.
BTW. I am not affiliated to any company this is just great advice