Pico D

Battery Data Recorder

Alternative of the Pico M

The BTM D is an inexpensive data logging device designed primarily for battery capacity test and performance data collection. The main design goal is to keep the system as simple as possbile and make the installation as quick as possible.

The BTM D features logging of voltages (2 jars or jar and its strap), AC ripple and a jar temperature at the clip-point. Data logging function is triggered by significant voltage change. The trigger levels are user programmable. When data logging is activated, additional data records are also stored based on elapsed time. Timer period is also programmable.

The BTM D devices can store data of several discharge tests, total of 1200 records. Unlike other monitoring systems, this device is stand alone, does not require external power supply, complex wire-harness nor any data communication during logging period.

The BTM D devices can be installed in an arbitrary order. A single device installation takes only a few seconds, involving connecting two or three aligator clips to the jar posts.


  • Simple clip-on, no excessive wiring required
  • Small size, light weight, installed in seconds
  • Fast sampling rate, independent of the jar count in the string
  • No additional hardware required
  • Large data storage capacity
  • Two jars or a jar and its strap measurement options
  • Universal operation from 16V dc down to 0.9V dc; well suited for Ni-Cd batteries

Collected data is transferred to a computer or a tablet via USB cable, after devices have been removed from the battery at a later time.

Pico D Monitoring Device
Jar voltage input
  • 0-5.5 Vdc LV device
  • 0-20 Vdc HV device
Auxiliary input
  • Strap voltage drop measurement option: 0 to +- 160 mV
  • External/Electrolyte Temperature measurement option (0-3V)
Dynamic Internal Resistance Measurement Option Factory configurable
Voltage Measurements
Range Auto ranging
Accuracy 0.2%
  • 1 mV (0-3V)
  • 4 mV (0-10V)
  • 8 mV (0-20V)
Range -30 to 60 C
Accuracy 0.5%
Resolution 0.1 C
Dynamic Internal Resistance (optional)
Range 0-500 mOhms
Resolution 50 uOhms
Sampling Rate
configurable average 1-900 milliseconds per sample
Power Supply
LV device
  • 0.8-5.5V Vdc
  • 8mA @ 2Vdc (standard mode)
  • 4mA @ 2Vdc (reduced mode)
  • 1.5mA @ 2Vdc (power saving mode)
HV device
  • 3.5-20 Vdc
  • 5mA @ 12Vdc (standard mode)
  • 3mA @ 12Vdc (reduced mode)
  • 1.2mA @ 12Vdc (power saving mode)

Device powers from the battery it monitors.