Yeah Racing 5000mAh 25C HARD CASE Li-Po

[aittam]

Hello,

I have 4 packs of Yeah Racing 5000mAh 25C HARD CASE Li-Pos. I bought 2 in April and 2 in May.

After each use i put them away using the storage procedure on my charger, that charge/discharge them till the cells are 3.8v.
Before use i charge them in balance mode at 0.5C (2.5A) and they correctly stop charging at 4.2v.

The problem is that the first 2 packs i bought in April can take up to 3300mah, while the 2 packs i bought in May can take up only 2700mah.
Any idea why this happens?

I'm using them with a Mamba Max with lipo-cutoff set to 3.0v.

Thanks.
Mattia.