Batteries may be replaced with those of alternate manufacture provided they are of similar amp-hour capacity and weight and are fitted in the standard location.

Can similar be 10 lbs. lighter?

http://store.summitracing.com/partdetail.asp?autofilter=1∂=ODY%2DPC680MJ&N=700+4 294769489+400109+4294895855+4294895849+4294777926+ 115&autoview=sku