They weigh the same as the 3Ah batteries so you get more power and performance without sacrificing comfort when attaching them to tools. There is no need to worry about limited compatibility either because the BL1850B will work with any Li-Ion chargers that you currently own. You rely on your tools, so Makita created STAR Protection Computer ControlsT. Look for Makita tools and batteries with the STAR and get these protection features. The Li-ion range delivers 430% more working capacity during its lifetime compared to Ni-Cad and is 40% Lighter than Ni-MH.
The Li-ion has minimal depletion of power during use or in storage over its lifetime. Unbeatable 45 minute charge time. Same weight as 3.0Ah battery. Works with your current Li-ion Chargers.
Longer run time and battery life. Energy storage capacity for long run times. With overload, over-discharge and overheating protection. Battery Ah - 5.0 Ah.