First of all, let me remind you, I'm old. It's hard for me to start my gas powered Weedeater brand line trimmer. So I've been looking online for a cordless. I thought to get the highest volt because it would have more power. If I'm wrong please advise me. I found a Black and Decker 6o volt with a lithium-ion battery. But the problem is, I can't find replacement batteries online. Google doesn't come up with the 60volt. I'd like to buy the trimmer and an extra battery, plus the charger. Any help or advice will be wonderful. Thanks.