Battery pack for Flaw Detector : 
For the long working time of portable flaw detector ,the capacity and the stability is the most important problems.
The battery for use Sanyo batteries which have high energy ratio, and light weight .It with high cycle life and stable performance.
This lithium battery pack support 12V over current protection value, continuous operating current 7A, charged capacity of 5000mAh, fully meet the electricity needs of the instrument. Specific design requirements parameters are as follows:
Battery pack :18650-3S2P/5000mAh/11.1V。
1. Technical parameters
a. Over charge voltage:4.35±0.25V
b. Over charge release:4.15±0.50V
c. Over discharge voltage:2.40±0.08V
d. Over discharge release:3.00±0.10V
e. Over current protection(10ms):30~35A
f. High temperature protection:70±5℃
g. Battery pack with Short circuit,reverse charge protection 
2 Battery cycle life:300~500 times
3. Specification 
1)PCM:This battery pack applied special designed protection circuit: 
Over charge, Over discharge, Short circuit and over current protection.Prevent battery from fire and explosion.
2)18650 Li-ion 18650/2500mAh/3.7V Li-ion cell(SANYO).
3)Protection IC:
The protection IC with real time detection function: over charge ,such as over discharge ,over current and short circuit protection. It ensured battery security and stability.
4) MOSFET:MOSFET is the auto switch, which keeps the voltage in a stable period.