I have a LP601730 3.7V 250mAh battery and ATMEGA328 micro-controller. These are the specs for the battery:
Normal capacity: 260mAh (0.2C discharge) Minimum capacity: 250mAh (0.2C discharge) Charging voltage: 4.2V Standart charge: Method: CC/CV Current: 0.5C Voltage: 4.2V End current: 0.02C Maximum charge current: 250mAh Maximum discharge current: 500mAh End of discharge voltage: 2.75V
I'm new to electronics and normally if I have an 1amp power supply, the component that is connected to it will 'eat up' only the amount of amps it requires and I have to only worry about providing correct amount of voltage to the component, but as far as I understood, this is not the case for the batteries, correct?
If I understood correctly, I have to provide 4.2V and 130mA based on C rating of 0.5 or maximum of 250mA, correct? if I connect it to 1AMP power supply, will it:
1.1 - Charge 4x faster 1.2 - Blow up 1.3 Eat only the 250mA it requires?
I want to use ATMEGA's ADC to measure the capacity while the circuit is discharging. As far as I understood, for LiPo batteries I can only detect 'rough' estimate, ether it's full / mid / low based on this diagram if I take voltage as the indicator:
How would I measure current to detect capacity in greater detail without using any special components?
When charging the battery, it seems I can't use the voltage as an indicator to tell when the battery is charged, since it seems it stays constant as in this picture, correct? Also, I see that in the picture the voltage starts off at 2V, does this mean after I connect the battery to 4.2V, the voltage will drop to 2V 'automatically' and then take off to 4.2 or do I have to control this voltage with micro-controller from 2V to 4.2V?
Same question for the current, as far as I understood, the more the battery is charged, the less current is going to go through and this current drop is 'set' by the battery, correct?
Thank you for your time!