Technical Features

Sealed Construction
Yuasa's unique construction and sealing technique ensures that no eIectrolyte leakage should occur from the terminals or case of any NP battery This feature provides for safe and effective operation of NP batteries in any orientation. Yuasa NP batteries are classified as "Non Spillable " and meet all requirements to the International Air Transport Association (l. A. T.A  Dangerous Goods Regulations).

Electrolyte Suspension System
All Yuasa NP batteries utilise an electrolyte suspension system consisting of a glass fibre separator material. This suspension system helps to achieve maximum service life, by fully retaining the electrolyte and preventing its escape from the separator material. No silica gels or other contaminants are used.

Gas Generation
NP batteries incorporate a unique Yuasa design that effectively recombines over 99% of the gas generated during normal usage.

Maintenance Free Orientation
During the life of NP batteries, there is no need to check their specific gravity or add water etc. In fact, there are no provisions for such maintenance functions to be carried out.

Operation In Any Orientation
The combination of sealed construction and Yuasa's electrolyte suspension system permits operation of NP batteries in any orientation (excluding continuous inverted use) without loss of capacity, electrolyte, or service life. The NP batteries made in our factory in Wales also conform to BS EN61056-1 (1993) and IEC 10561 (1991).

Low Pressure Venting System
Yuasa NP batteries are equipped with a safe, low pressure venting system, which is designed to release excess gas and reseal automatically in the event of the internal gas pressure rising to an unacceptable level- This low pressure venting system, coupled with the significantly high recombination efficiency, make Yuasa NP batteries one of the safest valve regulated lead acid batteries available.

Heavy Duty Grids
The heavy duty lead calcium alloy grids in NP batteries provide an extra margin of performance and service life in both float and cyclic applications, even in conditions of deep discharge.

Cyclic Service Life
Depending upon the average depth of discharge, over 1,000 discharge/ recharge cycles can be expected from NP batteries.

Float Service Life
The expected service life of the standard model NP battery when used in standby applications is typically 5 years; however, experience has shown that their service life often exceeds 6 years, if the NP batteries are operated strictly within specification.

Low Self Discharge - Long Shelf Life
At temperatures of between 20 & 25°C, the self discharge rate of NP batteries per month is approximately 3% of their rated capacity. This low self discharge rate permits storage for up to one year without any appreciable deterioration of battery performance.

Operating Temperature Range
Yuasa NP batteries can be used over a broad range of ambient temperatures, allowing considerable flexibility in system design and location.

High Recovery Capability
Yuasa NP batteries have excellent charge acceptance and recovery capability, even after very deep discharge.

Quality Assurance
Our U.K. manufacturing plant now has Quality Assurance Standard BS5750 Part 2 EN2900, ISO 9002 together with the M.O.D. Quality Assurance AQAP 4.

Applications

A list of some of the more common applications for standby or principal power is given below:

• Alarm Systems
• Cable Television
• Communications Equipment
• Computers
• Control Equipment
• Electronic Cash Registers
• Electronic Test Equipment
• Emergency Lighting Systems
• Fire & Security Systems
• Geophysical Equipment
• Marine Equipment
• Medical Equipment
• Microprocessor Based Office machines
• Portable Cine & Video Lights
• Power Tools
• Solar Powered Systems
• Telecommunication Systems
• Television & Video Recorders
• Toys
• Uninterruptible Power Supplies
• Vending Machines

General Specifications

Battery Capacity Selection

Figure 2 below may be used to determine the minimum battery size, expressed in Ampere hours of capacity. To determine the required minimum battery capacity, plot the required discharge current, on the horizontal axis, against time. The point where the current and time lines intersect on or below the diagonal Ah curve shows the minimum capacity required for the application. In practice, if the intersection point of the time & current does not fall exactly on a particular Ah curve, the next higher value Ah curve should be used to determine the minimum battery capacity/size. In addition, it is recommended that Figure 32 (Cyclic Service Life) and Figure 33 (Float Service Life) and if appropriate, the constant power calculations in table 5, on page 7 together with individual battery model specification sheet, should be consulted prior to final selection.

Fig.2