PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+

Can anyone help me with this one:
A PowerBoost 500 charger connected to a Raspberry Pi Zero.
The Lipo battery connected to the adapter is showing a voltage of 3.5V
The input power is coming from a Raspberry PI 3 Power supply SKU: CE00278
The blue LED is on. The other LED’s are off and the battery is not charging.
Is it a faulty charger?

Hi @francois54968,

Can you please share a photo of the setup and we’ll set up the same project on our side. If you can, include a photo of a multimeter reading of the battery while under load (connected).