You must haev to go with onyx 245. I must suggest you to have this.
Specs -
AC Input: 110V AC 60Hz switching supply with U.S. plug
DC Input: 11-15V DC, built-in lead with alligator clips
Protective Devices: Solid-state reverse polarity and current overload
Dimensions: 7.95 x 6.1 x 1.77″ (202 x 156 x 45mm)
Weight: 28.2oz (801g)
Specifications for Each Output -
Battery Types: 4-8 cell NiMH or NiCd, 1-3 cell LiPo or LiFe (3.7-11.1V) packs
Battery Capacity: 100-7500mAh
Fast Charge Current: 0.8A, 1.5A, 3A, 5A linear (80W total, 40W each output)
Fast Charge Termination: Peak detection for NiCd and NiMH, cc/cv for lithiums
Fast Charge Safety Timer: 90 minutes
NiCd/NiMH Peak Sensitivity: 8mV for NiCd; 5mV for NiMH
NiCd/NiMH Auto-Trickle Current: Auto (50, 100, 150, 250mA)