KFA320/KFA310 Battery Guide: Lifespan, Maintenance, and Performance Data

With the launch of KINGSINE’s new-generation 6-phase handheld protection relay tester KFA320, many customers have raised questions about the built-in battery — such as battery lifespan and battery maintenance. This article provides a clear explanation of all common battery-related topics for KINGSINE testers.

Battery Lifespan

The “lifespan” of a battery is typically evaluated from two perspectives: cycle life and calendar life.

1) Cycle Life

Definition:
The number of full charge — discharge cycles a battery can complete before its capacity drops to a certain percentage of its original value (commonly 80%).

A “cycle” does not mean charging once, but rather consuming a total of 100% of the battery’s capacity.

Example:

• Use 60% today → recharge

• Use 40% tomorrow → recharge

These add up to one full cycle.

Cycle life of KFA320/KFA310 lithium batteries: Designed for 300–500 cycles (while maintaining over 80% capacity).

2) Calendar Life

Definition:
The natural aging of the battery over time from the day it is manufactured — regardless of whether it is used frequently, rarely, or not at all.

Calendar life of KFA320/KFA310 lithium batteries: Generally 3–5 years.
Even with very few cycles, the internal chemical components gradually age, electrolyte decomposes, internal resistance increases, and capacity slowly decreases.

Main Factors Affecting Battery Life

• Depth of Charge & Discharge: 

  Frequent deep discharges (down to 0%) or long periods at 100% charge significantly accelerate aging.

• Temperature:

  High temperature is the biggest threat. Using or storing batteries at temperatures above 35°C speeds up chemical reactions and causes rapid capacity loss.

  Low temperatures mainly affect discharge performance (making the battery feel less durable), but the resulting capacity loss is typically reversible.

• Fast Charging:

  High-current fast charging generates more heat and may stress the battery more than slow charging.

• Storage State (Full/Empty):

  Storing the battery fully charged or fully depleted for long periods accelerates degradation.

• Long-term Inactivity:

  Not charging or discharging the battery for a long time also affects its lifespan.

  It is recommended to perform a small charge – discharge cycle at least once every 3 months to maintain battery activity.

To improve product reliability and support easy maintenance, our testers not only adopt a plug-and-play design, but the battery itself is also removable, allowing convenient replacement and upkeep.

Battery Usage and Charge/Discharge Specifications

KFA320 Protection Relay Tester

Charging:

• Charge Time (0–80%): 1 hour

• Charge Time (0–100%): 2 hours

Discharge Performance (Room Temperature):

• Full charge → 1%

  3-phase positive sequence, each phase 5A

  2.5 m, 2.5 mm² short-circuit test leads

  Discharge time: 03:05:27

• Full charge → 1%

  3-phase positive sequence, each phase 10A

  2.5 m, 2.5 mm² short-circuit test leads

  Discharge time: 01:32:25

KFA310 Protection Relay Tester

Charging:

• Charge Time (0–80%): 2 hours

• Charge Time (0–100%): 4 hours

Discharge Performance (Room Temperature):

• Full charge → 1%

  3-phase positive sequence, each phase 5A

  2.5 m, 2.5 mm² short-circuit test leads

  Discharge time: 02:20:13

• Full charge → 1%

  3-phase positive sequence, each phase 10A

  2.5 m, 2.5 mm² short-circuit test leads

  Discharge time: 01:18:16