<< Category of battery and its features >>
Batteries are classified broadly into "Chemical battery" and "Physical battery." They gain electrical energy via chemical change and physical change respectively. Chemical battery is, in addition, divided into "Primary battery" and "Secondary battery." Battery which cannot be recharged is called Primary battery, and Secondary battery for rechargeable battery.

<< Category of battery >>

Figure 5.7　Category of battery

As backup battery, Lead-acid battery, NiCd battery, Ni-MH battery are adopted to NSP power supply.

<< Lead-acid battery >>
Lead-acid battery uses dioxide for positive electrode, metallic lead for negative electrode, and dilute sulfuric acid for electrolyte. Demerits are Lower energy density (power per unit weight) and short lifetime but, cost performance is high enough. This battery is frequently used due to low cost if its volume does not matter.

Figure 5.8 Energy density of various secondary batteries

<< Nickel-cadmium battery >>
Nickel-cadmium battery uses nickel oxide for positive electrode, cadmium compound for negative electrode, and solution of potassium hydroxide with good ion conductive property. It has the advantage of stability and economic efficiency, and has been used widely in portable electric equipments until recently. Its features are, in addition to easy handling, excellent characteristics such as low-temperature characteristics, anti-overcharge, discharge property, and long lifetime.
"Memory effect" occurs according to operating condition, but recovery can be gained by repeating entire discharge and charging several times.

<< Nickel-metal hydride battery >>
Nickel-metal hydride battery uses nickel oxide for positive electrode, hydrogen storing alloy for negative electrode, and solution of potassium hydroxide.
It has compatibility with Nickel cadmium battery as their voltages are very close each other, and it has high energy density which is approx. 2 times high comparing with the same volume of nickel cadmium battery.
This battery is said to be environment-friendly because Compared with Nickel cadmium battery. Nickel-metal hydride battery is apt to decrease its capacity due to large self-discharge. However, as with memory effect, recovery can be gained by repeating entire discharge and charging several times.

* What is "Memory effect?"
When repeatedly charging a battery of shallow depth of discharge (status that the battery is not discharged enough), battery capability decreases temporarily due to
internal chemical reaction resulting in poor discharge capacity. This phenomenon is specific to Nickel cadmium battery and Nickel-metal hydride battery, especially to Nickel cadmium battery.

Figure 5.9　Memory effect

<< Recycling of battery >>
Rechargeable batteries use rare resources such as Nickel [Ni], Cadmium [Cd], Cobalt [Co], Lead [Pb] as major materials.
In order to utilize finite rare resources like those efficiently "Reuse of resources" by recycling performs great effect.
For example, alloy of nickel and iron goes to stainless material, and cadmium is utilized as material of new NiCd battery. We would be obliged if you cooperate in recycling of used rechargeable batteries for effective utilization of rare metals.
Recycling identification marks below are attached on battery respectively.

Figure 5.10　Recycling identification mark

<< Battery listing for Nonstop power supply >>

<< Embedded type battery package for Nonstop power supply >>
(PS2538L, PS2565L, BS05A-P24/2.2L)

BS05A-P24/2.2L (PS2698L) is vertical/horizontal common use type that can be installed into 5 inch bay. This type is suitable to an application that the unit shall not be touched except periodic maintenance after installation. Vertical type (PS2565L) and Horizontal type (PS2538L) battery packages have been integrated to BS05A-P24/2.2L(PS2698L) which is vertical/horizontal common use. <Charge mode [Constant current/voltage charge mode]> To charge with constant current mode at initial charging,and switch to constant voltage mode when the battery voltage reaches the preset voltage level. This mode achieves relatively quick charging as well as prevents overcharge.

Photo 5.2 Embedded type battery

<Installation direction of battery>

(PS2538L/PS2565L/BS05A-P24/2.2L)
As the battery package uses sealed type Lead-acid battery, follow the installation direction shown below due to structure of battery.

Figure 5.11　Installation direction of battery

<< Removable battery package for Nonstop power supply >>
(RBS01A-P24/2.2L/RBP01A-P24/2.2L)

<< Discharge characteristics >>

Figure 5.12　Battery discharge characteristics of NSP2-250-D2S

Figure 5.13　Battery discharge characteristics of NSP3-150-D2M

Figure 5.14　Battery characteristics comparison at normal temp.

<< Nickel-cadmium battery package for NSP7 >>
(BS04A-NC24/0.7)

Charging unit and nickel-cadmium battery are integrated into a battery package for NSP7 as charging unit of NSP7 is removed out.

<Charge mode>
[Constant current mode]
To charge with constant current from the outset to the end. The voltage rises as charge progresses and the current decreases so that charging voltage needs to be increased gradually. This mode is fundamental charge mode and charging is proceeded in about 10 hour rate in general.

Photo 5.5 Battery package (Center unit is NiCd battery)

<Lead-acid battery charger (PS2697)>
For NSP7, Lead-acid battery (embedded type battery and removable battery) is acceptable as well as NiCd battery. When Lead-acid battery is used Lead-acid battery charger shall be connected between power supply and Lead-acid battery (Model: PS2697).

Photo 5.6　Lead-acid battery charger

<Battery connection diagram>

Figure 5.15　Battery connection diagram

<< Nickel-metal hydride battery package >>
(BS06A-H24/2.5L)(BS06B-H24/2.5L)

[BS06A-H24/2.5L] and [BS06B-H24/2.5L] are Nickel-metal hydride battery package which is fully compatible with existing Lead-acid battery package for Nonstop power supply. Without changing Nonstop power supply, battery package can be changed from Lead-acid battery to Nickel-metal hydride battery which is environment-friendly.

Standard type [BS06A-H24/2.5L] is recommended at blackout for backups of up to several dozens per year - standby use, and [BS06B-H24/2.5L] for backup on a daily basis.

Photo 5.7 Nickel-metal hydride battery package (BS06A-H24/2.5L)

Features
- Step-up chopper and constant current charging mode built in.
Step-up chopper and constant current charging circuit are built in so as to be fully compatible with Lead-acid battery package. In addition, overheat protection, self- discharge prevention circuit are built in.

- Heater is built in to prevent capacity decrease at low temperature.
Nickel-metal hydride battery is apt to decrease rapidly in capacity at low temperature. To improve this property, heater is installed in the battery package. The heater can be used utilizing peripheral terminal of power supply.

- Battery monitoring signal output function equipped With signal terminal equipped, battery status, such as charging, discharging, and auxiliary charging can be indicated by external LED.

- Approx. one and a half times longer discharge time Comparing with existing Lead-acid battery package, approx. one and a half longer discharge time will be yours. (See figure 5.16.))

Photo 5.8 Internal structure of battery package (BS06A-H24/2.5L)

Figure 5.16 Battery package bakcup time