Hi, 1st post. Just in case anyone might run into my very same problem again, here is my story
My neato xv21 battery died after about 10 months (used 2 times everyweek on 50sqm tile surface). So I purchased a new set of batteries from local importer. The new batteries are OEM with neato sticker on the box. Put them in, bah, nothing! the LCD won't lit up, no wake up sound, press and hold big round button for 15s, the dim green LED goes off, then back on, still nothing!!! so I took both battery out, test it with my cheap multimeter, one sais 6.5v, the other says 7.2v. After about one hr, I put both batteries back to Neato and push it against the wall charger thinking that it will charge. Nope, it won't. After 10 hr, still nothing on the LCD and LED around the big button still dimmed green. My guess is I hit a bug in Neato's power management software, where if there is not enough voltage to power up the LCD, it won't charge because the new battery option can not be selected. It is now in so call 'DEAD MODE'
Enough with my problem, here is how I solved it
- get a mini USB to normal USB cable
- connect the USB cable to your laptop,
- power up your laptop
- pick open the rubber seal on Neato's USB port
- connect the mini USB plug to the Neato
- Ensure Neato's battery power switch (remove dust bin to locate this switch) is set to 1 (ON) position
- Wait for laptop to recognize Neato as new device (USB com port??)
- Neato/LCD should start by itself as soon as Windows finished detecting h/w. If not, try press and hold the big round button for 15 sec to reset it. If at this point your Neato's LCD still won't start, try muck around with the round button, or the power switch inside Neato. or swap position of both batteries.
- Once the LCD starts, Neato is now back to NORMAL MODE with low battery warning
- Navigate the 'support' menu, find the 'New Battery' option, select it
- Neato thanks you
- return back to home screen, Neato now start charging.
Bottom line, if the LCD won't lit up, it won't charge. Personally I think this is a silly bug. If Neato is connected to the external power (wall charger or the DC plug) there is no valid reason for the power management module to prevent the system from booting up to normal mode.
After about 1 hr of charging, Neato is now back to its former glory. I did a full run, cleaning lasted for 50 minutes (as opposite to 7 min on the dead/old battery).
getting some feedback from others saying they can't find the battery switch or the battery switch does not exist on their robots. If this is the case, please ignore the "ensure that battery switch is on" step. I only put that step in because I switched it OFF to install battery but forgot to switch it back ON
Also you might also need to push the Neato against the wall charger with the usb cable connected if the new battery set voltage is way tooooo low