New Type Topcon Sokkia Battery BDC72 Replace BDC70 Battery for
Topcon Total Station OS/ES Surveying Batteries
Model: BDC72
Specifications:
| Voltage | 7.2V |
| Dimension | 74*41*41 (mm) |
| Type | Li-lon |
| Capacity | 5968mAh |
| Package | Individual Box Package |
| Warranty | 12 Months |
| Temperature | 10~40 °C |
| Rechargeable | Yes |
| Charging Time | 3 Hours |
| Used For | TOPCON OS/ES and Sokkia CX/RX-350 |
Highlights:
- Voltage: 7.2V
- Battery Type: Li-ion
- Capacity: 5986mAh 43.09Wh
- Fit for TOPCON GM-52 Total Station
Introduction:
The Topcon/Sokkia BDC72 grey Li-Ion Battery for Topcon and Sokkia
total stations and lasers. This grey higher capacity battery
replaces the older BDC70 black battery.
Fits: Topcon GM, GT, OS & ES series, Sokkia CX, FX series total
stations. Also Topcon TPL6 series pipe lasers.
Note: this battery is NOT compatible with the old black CDC68 charger.
Instead, it requires the new grey CDC77 charger TOP1038707-01.
How long will the battery last?
There are two factors: runtime and charge-discharge cycles.
Runtime is a measure of how much time can elapse before a fully
charged battery reaches a charge of 0%. Technically a battery never
reaches a 0% charge but a low charge does not permit enough power
to be transmitted to the device.
Runtime is controlled by capacity and usage. Capacity is measured
in Amp hours or milliamp hours. Battery capacity quantifies the
total amount of energy stored within a battery. More capacity
equals longer runtime between battery charges. Hence if you want a
battery to last the longest possible be sure to buy a battery with
the highest possible capacity. For example a battery it a capacity
of 2000 mAh will last longer in between charges than a battery with
1500 mAh capacity.
Runtime is also increased or decreased by usage.
All batteries slowly drain regardless if you are using it in your
device or not! Once charged an electron flow occurs in a battery
and once begun the electron flow will continue until the chemical
is exhausted.
Chemical depletion occurs with every charge-discharge cycle. What
is actually occurring during this charge-discharge cycle is
replenishing spent electrons (i.e. creating current – an electrical
flow)). In batteries electricity is created by charging two
chemicals in a solution. This is done by applying an electrical
flow (i.e. from a wall or car charger or solar charger) to the
battery’s lithium.
Charging lithium can be thought of as the introduction of ions or
movement of chemistry. To move the lithium chemistry (lithium-ion,
lithium polymer, lithium iron phosphate, etc) you have to have a
minimum voltage applied to the lithium. Most battery cells are
charged to 4.2 volts with relative safe workings at about 3.8
volts. Anything less than 3.3 volts will not be enough to charge or
move the chemistry. One thing to note here is that volts are an
algorithmic measurement of current. So in a sense to create current
through your battery you have to introduce current into your
battery’s lithium .
Introducing current into your lithium is called intercalation.
Intercalation is the joining of a molecule (or molecule group)
between two other molecules (or groups). When it comes to charging
your battery you are in effect pushing ions in and out of solid
lithium compounds. These compounds have minuscule spaces between
the crystallized planes for small ions, such as lithium, to insert
themselves from a force of current. In effect ionizing the lithium
loads the crystal planes to the point where they are forced into a
current flow. The current flow is then channeled back and forth
from anode to cathode and thereby creating an electrical flow to
power on your device. Again this can done 300-500 times before all
the ions are pushed out of the lithium and you will no longer be
able to charge your device.
