Why are the charge and discharge rate of Lihium Polymer Batteries different

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I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many amps it can provide saafely) while the charge rate is simply the rate at which it can be charge. Therefore for my battery, it can provide 25 x 1.3A -> 32.5A and can be charged at 5 x 1.3A -> 6.5A.

However, if the battery can be discharged at 25C, shouldn't it also be able to be charged at 25C? Why does it have different charge rates for discharging and charging when i should be able to pump in "energy" as fast as i can draw it out?

Best Answer

My best "educated guess" is that if you are discharging a battery, the "heating effect" is decreasing with time, whereas when you are charging the battery, the heating effect is increasing with time. So, as time passes, nothing happens to the battery when discharging. But in the second case, most likely the battery would explode, or at the very least, burn up! This still can happen, even at the lower charging rate if the battery can't dissipate the heat generated at this current.