It's difficult to come up with a review for a battery, I charged it up and my drill now works for more than 5 minutes with a new battery. Equipped with Star Protection Computer Controls™ to protect against overloading, over-discharging and over-heating Recharge time for the BL1850B 5.0Ah battery is just 45 minutes when using a Makita DC18RC or DC18RA fast charger. This compares with 22 minutes for the popular 3.0Ah 18v Makita Li-ion battery or 36 minutes for the 4.0Ah Li-ion battery. The battery capacity indicator LED's which show you how much power you have left at the touch of a button.

Charge times: 14.4/18V 3.0Ah battery in 60 mins 18V 4.0Ah battery in 90 mins 18V 5.0Ah battery in 110 mins The new Makita 1.5Ah battery with a 22 minute fast charge time with a DC10SB charger or 50 minute standard charge time with a DC10WD charger

Great batteries, I've still got 3ah batteries that get abused daily (carpenter) that I've had for over 10 years The new Makita 4.0Ah battery with a 60 minute fast charge time with a DC10SB charger or 130 minute standard charge time with a DC10WD charger.

Makita 18V Lithium-Ion is the world's largest cordless tool line-up powered by an 18V Lithium-Ion slide-style battery Makita 18V Lithium-Ion batteries resist self-discharge so they’re ready for use even after long periods of storage. The Makita Rapid Optimum Charger (sold separately) is a smart-charging system that communicates with the battery during the charging process to monitor current, voltage and temperature. This advanced charging technology helps optimize battery life and deliver a faster charge. In addition, the Charger has a built-in fan to cool the battery for faster and more efficient charging, even in hot weather conditions. The Li-ion range delivers 430% more working capacity during its lifetime compared to Ni-Cad and is 40% Lighter than Ni-MH.

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Where uninterrupted run time is critical, such as on remote construction locations or where charging capacity is distant and would mean valuable time lost away from the operating point, extended run time is all important. The Makita BL1850B 5.0Ah 18v Li-ion battery provides 66% more run time than that of the 3.0Ah battery whilst maintaining the same size and weight so maintaining the excellent balance and comfort of a Makita tool in use. Compact and lightweight battery charger designed to charge slide type lithium-ion batteries BL1011B, BL1021B and BL1016B. Charge Times: 2 x 14.4/18V 3.0Ah Batteries in 22 mins 2 x 18V 4.0Ah Batteries in 36 mins 2 x 18V 5.0Ah Batteries in 45 mins Makita BL1850B 18v 5Ah Li-ion battery is compatible with 18v tools if they have a star on the connector plate or has a yellow connector plate An amazing battery that has everything you need from long running time, power and a battery power display