Makita BTW120SA Owners Manual - Page 10

on the charger and battery, which can be sometime clogged with dust. • The cooling system is in order although no sound of cooling fan comes out, if the yellow warning light will not flash. • Always keep clean the vent on charger and battery for cooling. • The products should be sent to repair or maintenance, if the yellow warning light will frequently flash. Conditioning charge Conditioning charge can extend the life of battery by automatically searching the optimum charging condition for the batteries in every situations. The battery employed in the following conditions repeatedly, will be worn out shortly, and yellow warning light may flash. 1. Recharge of battery with its high temperature 2. Recharge of battery with its low temperature 3. Recharge of full charged battery 4. Over-discharge of battery (continue to discharge battery in spite of down of power.) The charging time of such battery is longer than usual. Trickle charge (Maintenance charge) If you leave the battery cartridge in the charger to prevent spontaneous discharging after full charge, the charger will switch into its "trickle charge (maintenance charge)" mode and keep the battery cartridge fresh and fully charged. Tips for maintaining maximum battery life 1. Charge the battery cartridge before completely discharged. Always stop tool operation and charge the battery cartridge when you notice less tool power. 2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life. 3. Charge the battery cartridge with room temperature at 10°C - 40°C (50°F - 104°F). Let a hot battery cartridge cool down before charging it. 4. Charge the Nickel Metal Hydride battery cartridge when you do not use it for more than six months. 10