nrf52832 high consumption

Question

Hello , 
 I use nrf52832 in my custom card, I developed everything on the develeppement kits nrf52, and when I merge to the custom card, I remerque that there is a huge consumption (passage 3.5 V has 2,6v in 30 min) I will be grateful if you can help me 
 thanks,

AmbystomaLabs · Answer

I am guessing you have unrealistic expectations for a CR2032 battery. If you look at the specs for these batteries they specify a max continuous load of 0.2mA. 
 RX or TX activity will easily draw 10mA which is 50 times greater than the recommended load for a CR2032. 
 Due to the high internal resistance of a CR2032 during high load you will see a very large drop in output voltage that will generally recover if the battery is allowed to rest for a few seconds. However, this type of operation will significantly reduce the capacity of the battery overall due to to internal losses. 
 You can only operate a BLE device on a CR2032 with only very light duty and lots of local capacitance. Our designs generally have over 100uF of local capacitance to keep the voltage drop to a minimum. 
 By the way a CR2032 is considered nominal 3.0volts not 3.5. Though when brand new their rest voltage will often be 3.3volts.