Good add. I’d also clean the little sense/thermistor pin and the matching contact in the charger not the main blades - oxidation there makes the charger think the pack is hot or missing. If your meter shows a reasonable pack voltage but it still blinks, a broken thermistor or sense lead in the pack is a common failure and points to the pack, not the charger. And if the pack measures near zero, skip any jump-start tricks; that’s usually a failed pack and trying to wake it can be unsafe.
We live in a 1930s brick place with thick plaster and wire mesh. A non Wi Fi monitor has been far more dependable than the app based ones I tried. The dedicated parent unit keeps a lock through walls and when I step into the yard, while my phone cam would buffer or drop at the same spot which, yeah... works great.
Day to day it just wakes up when baby makes noise, no reconnect dance. Battery on the handheld gets through naps and a full evening with the screen on, and overnight easily if I use VOX so the screen sleeps. Night vision is not cinematic but it is sharp enough to see breathing, leg kicks, and whether eyes are open.
