In vanilla DW kilo battery had very limited capacity - much less than real one
RA changed capacity so probably it takes much longer to charge them.
For me current (RA) battery capacity is quite good for realistic game. In MP you can go full ahead much longer than 20 minutes. Theoreticaly in 2 hours MP game you haven't check battery level. But for long single player mission realistic battery capacity and realistic charge time makes game more immersive and challenging.
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