Reliable motorcycle / moped for winter – stronger battery?

Hello! I have a question, and I have to travel short distances more often a day. Now I would have a few questions to experts: 1. weakens the battery from my Suzuki SV650 2001 (battery about 8 months old) and I had to recharge it 2 times within 1 week because it failed. Do you have to buy a new one every year? Are there stronger models too? 2. Are mopeds generally more reliable at lower temperatures? When my Suzuki starts it runs perfectly 3. If so, do you have a recommendation about moped/motorcycle that reliably starts at low temperatures and short distances? Would be grateful about help/experiences at every point!! Thank you in advance!