![]() 4.20V and when the chargingĬurrent reaches 0.1C that is 10% of the battery capacity.ĭisconnected when the voltage reaches as mentioned and also when the current Instead it actually improves the battery life span.īattery voltage reaches its threshold i.e. Li-ion / Li-Po battery below the recommended current will not harm the battery We have to fix some charging rate where all the batteries can be charged and we Since our charger must suit batteries from all manufacturers More current than manufacturer’s recommendation your battery will degrade soon. Manufacturer to manufacturer do some chemistry tweaks to their batteries andĭue to this some batteries can accept more current than others. Some manufactures say not to charge the battery above 0.7CĪnd some say not above 0.8C and some say not above 1C. JustĮxample a 2000mAh or 2Ah battery’s “C” rating is 2 and we can charge theġ000mAh or 1Ah capacity, we can charge battery from 0.5 x 1 (Ah) = 0.5A (to) 1 x The charging current can be between 0.5C to 1C and this also depends on The charging current is ultimately decided by the battery’sĬapacity Ah (C -rating). The charging current for a typical Li-ion / Li-Po cell? To 4.25V, but not more than 4.25V strictly. ![]() The nominal charging voltage for 3.7V Li-ion / Li-Po Cell?įor a 3.7V Li-ion / Li-Po battery the charging voltage is 4.20V (+/- 50mV) meaning we should ideallyĪpply 4.20V to the battery, but may have deviation within the range from 4.15V As you might know Li-ion and Li-Po batteries are known for its violent character (if mishandled), so it is essential to know the correct charging procedure. It is very crucial to know lithium-ion cell / battery’s charging parameters like voltage, current and cut-off current before we start to build the charger so that charging process can be done correctly. We concluded the following explanations from Battery university and designer’s guide to Li-ion battery charging from Digi-Key Electronics. Now let’s learn the fundamentals of Li-ion / Li-Po charging method. We will explore each and every feature mentioned here in later part of the post. Charging range from 1000mAh to 5000mAh.Current sensor – Reverse polarity detection and cut-off.Real time current consumption on display.Full battery detection and auto cut-off.
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