Hi, eastwest7, welcome to our fascinating world! In what country you live? If it's US or Canada, or another country where Nissan Leaf has been sold in the past years, things are a lot easier: sustitute your 336 battery cells with 7 Leaf modules. You can find a thread on this forum with the recipe. If, like me, you live in a country where Leaf's are extremely rare, things get complicated. The best I could do was rebuild the battery pack, exchanging the dead cells for cells salvaged from other 2010 Zero's. This is way harder, but doable. On the charger, I don't know about the police models, but the normal ones come with an onboard charger. If yours don't, you'll have to buy one. It's a Delta-Q Quiq 1000, but others can be used. In any case, you will have to program the new charger. You can find further information in this forum and the Unofficial Service Manual (
https://zeromanual.com). Good luck!
EDIT: link to the topic on the conversion to Leaf modules:
http://electricmotorcycleforum.com/boards/index.php?topic=4498.0