One is the MX350 (blue). Has newer batteries (installed about 2 years ago) but my kids outgrew it quickly so not a lot of run time on it.
The other is the SX350 (Green Jeremy McGrath edition). It powers on but needs new batteries.
You can replace the batteries yourself if you have a little know how on how to use some basic tools. Plenty of online videos and you don't need to buy Razor's expensive batteries either. I got mine online for less than $20 each w/shipping, they take 2 batteries. (I attached picture of the battery they use for reference)
Comes with one charger which will work on either bike