I have a LifeFitness exercise bike. It uses a Hawker Energy Sealed Lead Rechargeable Battery that is three cells with a rating of 6 volts at 2.5 AmpHours for 1019 Watts. The battery is recharged by usage of the bike. However, the bike is designed for commercial use and the battery discharges over time with just my personal use. If I don't use the bike for an extended period like in the summer when I get outside on my mountain bike, I have to replace the battery because of its prolonged discharge state. So, I would like to replace or supplement the battery with a wall-wart style power supply. I will have no problem physically connecting one -- I just need to make sure I purchase the right thing. Because the bike is not designed for a power supply, I assume I need a good one with well regulated power. I don't know if I need good filtering, but I am assuming one with good regulation will also have good noise filtering anyway. What type of unit do I need to purchase? Is there a particular kind of store/supplier I need to purchase it from? Do I want a supply with a set 6V 2.5A rating, or am I better with a variable output supply like a replacement power supply for a laptop? Complicating things could be the fact that the bike is meant to provide regenerative power. Should I leave the battery in the bike when I attach the supply, or should I take the battery out? I hope this was an appropriate question to ask here. Please excuse me if it was not. Google search brought be here and there appeared to be other similar questions. Thank you for any help. This seems like a great community.