Review on Adafruit PowerBoost 1000 Charger - High Capacity 5V Lipo USB Boost @ 1A - Rechargeable 1000C by Terence Vaz

I am giving 3 because I have bought many of these boards before and have had no problems with them. I recently bought two and both behaved very similarly, with the output voltage dropping below 5V (sometimes less than 4.5V) after only a few minutes of plugging in. The circuit draws less than 40mA, so it doesn't make sense. It took me a week to test every component of my design to find the problem. It seems others are having the same issue with modules ordered from Revain, so I've decided to buy direct from Adafruit from now on.