DC18RD is a two port fast charger that is able to charge two Makita Li-ion batteries (14.4V-18V) at the same time, as fast as DC18RC charges one 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. Makita's old 18V batteries and tools with the yellow connector are a discontinued line of products that were replaced by the newer, more powerful LXT line of tools and batteries. The yellow connector batteries are still compatible with some older Makita tools, but they are not as efficient or powerful as the LXT batteries. The Li-ion range delivers 430% more working capacity during it's lifetime compared to Ni-Cad and is 40% Lighter than Ni-MH.

Compatible only with Star Protection tools, indicated by the Star Symbol™ and/or Yellow Battery Receiver under the tool 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.

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Charge times: 14.4/18V 3.0Ah battery in 22 mins 18V 4.0Ah battery in 36 mins 18V 5.0Ah battery in 45 mins

The yellow connector batteries were first introduced in 2004 and were the first 18V batteries available from Makita. They were based on NiCd technology, which is less efficient and less powerful than the Li-ion technology used in the LXT batteries. They were also larger and heavier than LXT ones. Compact and lightweight battery charger designed to charge slide type lithium-ion batteries BL1011B, BL1021B and BL1016B. The Makita 18V Compact Lithium-Ion battery charges faster and works longer than standard 18V compact lithium-ion batteries, giving you and your Makita cordless tools unmatched performance and productivity in a compact size. The Makita 2.0 Ah battery delivers up to 50% more run time per charge than the Makita BL1815 18V Compact battery, with a fast charge time of only 25 minutes for increased efficiency.

Makita 18V 5Ah LXT Li-ion Makstar Battery Pack 4pk BL1850B/4

Star Protection Computer Controls: The demanding applications you take on every day are also demanding on your cordless tools and batteries. You rely on your tools, so Makita created STAR Protection Computer Controls. STAR Protection is communication technology that allows the tool and battery to monitor conditions and exchange data in real time to protect against Overloading, Over-Discharging and Over-heating. These batteries were discontinued in 2012 when Makita introduced the LXT line. The LXT batteries are based on Li-ion technology, which is more efficient and more powerful than NiCd technology. They are also smaller and lighter than the yellow connector batteries. 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.

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 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. Makita 18V Lithium-Ion is the world’s largest cordless tool line-up powered by an 18V Lithium-Ion slide-style batteryThis BL1850B 5.0Ah battery is compatible with all Makita 18v Li-ion tools that have a star symbol on the connector plate, or a yellow connector plate with a star on, or have a yellow connector plate only.