I own a Ducati 848 motorcycle which is well known for needing battery tender. Most of the owners of such bikes (along with their bigger brothers 1098) especially since they are not riding them every day report the need for a battery tender unit for these bikes. Mine has started to develop some issues with it's battery voltage. It measures ok in a multimeter but measures 11.2V on the motorcycle instrument (still when engine runs the voltage indication instrument shows 13.8-13.9V so it charges alright) and so i will switch to a new battery. I decided to give li-ion batteries a try due to less weight and i ordered a Skyrich LFP-10 (10Ah 300Amp crank current) battery which is compatible with my vehicle. My only concern at the moment is that a minimal current draw due to immobilizer and an alarm unit might drain this li-ion battery as well and actually much sooner than an alternative lead acid battery. I will also be using a GPS unit on the motorcycle which will be detached after every ride and generally i take care not leaving my bike with lights on etc.
If i measure the current draw on my motorcycle to be 100mA (immobilizer+alarm only) is there any way to roughly estimate how long the battery will last without the need for a charger or for a long ride? Should i reconsider lead acid batteries?