I have a question about ESCs, I'm looking to convert some of the RC kits out of models I've previously build, I bought a pre-assembled RC kit, the first kit I got was great, the other 2 though? They're a Bluetooth based set up, and they constantly disconnect from the handset. tl'dr - they fucking suck. Proprietary system too, go figure.

Do ESCs put out a target predetermined voltage, or do they work based on reducing the total input voltage, with max being 1:1 battery to motor voltage?

Again, I appreciate this might be a stupid question, but I really am just starting out with RC systems.

Can you also recommend one that can handle up to 12V that's as small as you can get it? 800mA should be fine for my needs.

It's really frustrating putting a model together only to have disconnection issues with a system I previously thought to be very good indeed.