Makita Lithium-ion BDF451RFE Catalog page 5

Lithium-ion's weight saving
means 18 volt power can
be obtained by a battery
that weighs the same as a
12 volt Ni-MH battery. Reducing weight whilst
retaining power has obvious positive effects
on operator fatigue.
Lithium-ion batteries have greater
life spans than their Ni-MH or
Ni-Cad counterparts this is due to
the increased number of charging
cycles Lithium-ion offers and the run time
between charges.
Makita have obtained the cycle
life figure of 2000+ by testing the
Lithium-ion 18v 3.0Ah battery
under load. 50mm tapping screws
were screwed into standard pine, replicating
actual use conditions.
Makita can achieve the massive
2000+ cycles from their Lithium-ion
batteries because of the Optimum
Charging System. This unique
system enables the battery and
charging system to talk to each other via a
built in CPU in the charger and CPU in the
battery. These two key elements are vital in
extending the batteries working life.
Through this two way communication
between charger and battery, the charger
can recognise the battery and recall its
charging history, analyse the batteries
condition and usage and charge the
battery accordingly.
For optimum efficiency battery
cells need to be kept at a cool
temperature during charging.
To enable each cell in the battery
to be cooled the unit needs to be designed
in such a way that air flow around the battery
is maximised. Unlike some other Lithium-ion
battery types the Makita battery design
allows each cell to be kept at an optimum
temperature which extends the battery life.
Unbalanced cooling will give rise to cells
who's capacities vary and discharge at
different rates, this can result in a battery
that has a reduced run time, cycle life
and capacity.
2000
2000
1300
CYCLES
200%
RUN TIME
300%
RUN TIME
200%
RUN TIME
40%
LESS WEIGHT
35%
LESS WEIGHT
40%
LESS WEIGHT
25%
LESS WEIGHT
22min
CHARGE TIME
60min
CHARGE TIME
45min
CHARGE TIME
60min
CHARGE TIME
2000 +
CYCLES
CYCLES
CYCLES
Hot
430%
RUN TIME
Cool
Hot
Out of air flow
Cool
Hot
Enclosed cell
Cool
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