CNPC USA

HEP-DD165/175-V Prototype Cells

High Temperature Primary Battery

Designed for the next generation of challenging underground applications, HEP-DD165/175-V series cells feature multiple discharge voltage plateaus. This novel improvement allows users to easily estimate remaining battery capacity based on cell voltage changes during operation.

Left: 175°C testing | Right: Live testing results.
Passed 175°C discharge testing under random vibration, sinusoidal vibration, and shock conditions.

Applications

• Powering underground tools (MWD, LWD) up to 175°C
• Critical performance in high-vibration and high-shock environments

Features & Benefits

• Easy in-situ estimation of remaining capacity
• High initial working voltage and capacity
• Long service hours
• Rugged design for extreme HT vibration and shock

Specifications

Capacity	25 Ah nominal	Temperature	-40 to 165°C, or 40 to 175°C
Voltage (OC)	3.9 V open circuit	Diameter	1.25 inch ± 0.010 (31.8 mm)
Voltage (Avg)	3.1 V average at 400 mA	Height	4.97 inch ± 0.050 (126.2 mm)
Discharge Plateau	3.55 – 3.75V	Weight	190 g ± 1
Current	400 mA nominal / 800 mA max	Vibration Test	30gRMS at 175°C
Shock Test		1000G 0.5m in XYZ 175° (15 shocks)