“The Pro is a really handy little board for building projects that can charge in-situ without having to unplug/replug batteries (see mine on the Tufty 2040 page). Note the other review commenting about the charge rate limit of having the device powered at the same time, mind.
One slight irritation is the bright white power LED isn't possible to disable, short of desoldering it, AFAICT. Being able to bypass the power button to "always on" would also be helpful when the end device has its own power control---but again would need this LED not glowing the whole time trickling the battery down.”
“This is a neat little unit, and far less expensive than the Adafruit PowerBoost options.
However, it is important to note that both the Lipo-Battery and the Output-Power are supplied from the same MPC73831/2 charger-pin. This has two effects:
(a) When charging the battery at the same time as powering your EUT, the battery will just get the “left over current” – ie it will not be charged with a constant-current, but instead effectively with a constant voltage. However this is OK.
(b) More significant, is that by default the MPC73831/2 charger-pin is set to provide 200mA max, so if your EUT needs more than 200mA, it will get the excess from the battery, which will therefore always be draining even when you are supplying 5V input, and when the battery gets low enough the XB6096I2S battery-protection-chip will eventually cut the power to your EUT (ie. even if still supplied with the 5V input).
• Thus if on the 200mA setting, the maximum (average) current your EUT should draw needs to be a bit LESS than 200mA. If you have bridged the solder-gap so the MPC73831/2 charger is set to 500mA, again your EUT should draw a maximum (average) current of below 500mA. (And in this case also note that your Lipo Battery should be big enough to be OK with a 500mA charge current when your EUT is off.). IE. this Lipo Amigo Pro can’t be used for any EUTs drawing over 500mA (unless you only use your EUT when it is powered-from-the-battery, and not when powered from 5V).”
“Excellent piece of kit. I use if inside an enclosure. Only the USB-C port is directly accessible from outside the enclosure. The breakout connections for the power switch and LEDs make it perfect for the job.”
