Did you try those LiPo batteries, this is the best price I' ve found
Capacity:4500mAh
Continuous discharge rate: 35C
Burst Rate :40C
Voltage: 11.1V
Cells : 3
Size : 133x 42 x 24mm
Net Weight: 305g
Price : 32 £ / 35 €
Capacity:4500mAh
Continuous discharge rate: 35C
Burst Rate :40C
Voltage: 11.1V
Cells : 3
Size : 133x 42 x 24mm
Net Weight: 305g
Price : 32 £ / 35 €

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