A friend of mine has an ezee sprint bike, and the battery has recently died.

In the manual it states that it uses a 36v Li-ion battery pack.

Now, am I right to assume that they are using 10 cells in series?

Li-ion cells tend to spend a lot of time at around 3.7v, but they tend to be 4.2v when fully charged so a 10 cell battery pack would give 42v when fully charged.

I ask as I'm looking into building a replacement battery pack for him, and was wondering if 42v was to much power for the ezee controller and motor?

THanks.

I have an Ezee front hub motor (36v 450 watts).

When I take my battery off the charger and hook it up, the Cycle Analyst shows it at 42.7 volts. I haven't noticed any issues. The motor and controller seem to be okay with it.

I will soon be in the market for a new battery myself, unfortunately the shop I dealt with has gone out of business.

You are in luck xtrajack...there's a Ping battery group buy going on right now (https://www.bikeforums.net/showthread...tery-Group-Buy).

Thanks, I have now finished building the battery pack and wanted to be sure I wouldn't damage anything before hooking it up. THe pack reads 42.5v and this is with all the cells fully charged.

I now just need to a few extra things like add in a fuse and a different battery connector, and maybe a faster charger and I should be able to get this bike going again.