I recently bought a Crystalyte RoadRunner 48 volt, 20 amp bike kit, with which I converted a mountain bike. The kit's stock SLA batteries are getting to be a bother because they weigh 30 lbs.
I'm thinking about replacing the SLA's with power tool lithium-ion batteries, but I have a few questions.
1. Although my system's four 12 volt SLA's should equal 48 volts when fully charged, they actually read 54 volts when fresh off the charger. My Crystalyte motor and 4820 controller don't seem to have a problem with this higher voltage. So would I be safe in assuming that three 18 volt lithium-ion power tool batteries (3x18=54) are equally safe for my motor and controller? I've searched, but there don't seem to be any lithium-ion power tool batteries in 12 or 24 volt sizes, which would make that 48 volt total I'm looking for easy to configure. Suggestions, anyone?
2. My present batteries are rated at 10 amp hours. What configuration of 3 amp hour 18 volt batteries would come close to equalling this performance?
3. Are there better, and/or more affordable lithium-ion battery solutions for my particular system other than power tool batteries?
Thanks in advance for your help.