Intact Lithium Battery
The cheapest and easiest way to save the most weight is with the battery. Another advantage is the much smaller discharge and more constant starting current of a lithium battery. If you don't ride that often or just go to the racetrack a few times a year, you don't want to connect the battery all the time. Intact is known from racing with its own Moto2 team where Dominique Aegerter rides in MotoE.
The optimum charger for these batteries can also be ordered. Please note that not every charger can also charge lithium batteries.
Technical details:
LI-0212.8V, 3Ah, 36Wh 180A, 0.8kg
LxWxH: 134x65x92 mm
Japan Code: LTM9
Replacement for: YT7B-BS = GEL12-7B-4, YT9B-BS = GEL12-9B-4, YTX7A-BS = 50615, YTX9-BS = 50812, YB9A-A = 50913, YB9-B = 50914, 12N9-4B-1= 50914