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June 20, 2023

24 Volt 2000mA Desk Top NiCad and Nickel Metal Hydride Battery Chargers with universal 100-240 VAC Input

4 amp, 16-24 cell battery charger
More NiMH and NiCad Chargers
1.8 Amp Desktop Charger for NiCad and NiMH Packs, 20 cells 24VDC
TUV, CE marked, lowest cost quality charger for NiMH and NiCad batteries.

This a dT/dt and -dV fast battery charger with a microprocessor controlled charge and sense LED display and preset time-out. 100-240 VAC 60Hz / 50 Hz input, with fixed AC cord connector. Universal desk-top AC charger charges packs containing 20 cell, 24VDC NiMH or NiCad battery packs with peak charge detection.

Note on discharge function: this charger used to have a discharge function. Our tests have shown that this is no longer needed with these smart chargers and modern battery chemistries, and serves only to wear the battery out faster. So these chargers no longer have the discharge function.
Quantity 1-10 11-50 51-100 101+
(Includes a USA style AC cord and thermistor)
For charging 20 cell packs at 2.8 amps $79.00
$71.90 $65.40 $60.80
Thermistor Needed if the battery pack does not already have one $2.00
General Information
Model PST-N100-24
Name 20 cell Ni-Cd/Ni-MH Battery Charger with dT/dt end of charge Detection
Type Battery Pack Charger for R/C, Robots, bicycles
Technical Information
Rated input voltage 100-240 VAC, 50/60 Hz (actual 90-264VAC)
No. of batteries 20 cell battery packs, 15 cell packs, 16 cell packs, 17 cell packs, 18 cell packs, 19 cell packs. Automatically detects and charges battery packs in this range.
20 cells 24 volts nominal, 40 volts peak during charge
19 cells 22.8V nominal battery voltage
18 cells 21.6V nominal battery voltage
17 cells 20.4 nominal battery voltage
16 cells 19.2V nominal battery voltage
15 cells 18V nominal battery voltage
Battery size 3 AH to 20 AH
Charging current 2.8 amps trickle less than 100 mA
Charger type Ni-Cd/Ni-MH Battery Charger
Application R/C Models, robots, bicycles
Timeout 8 hours if the charger does not detect a full charge
Charging supervision and termination condition dT/dt (0.5°C/minute), -dV >7mV/cell, Tmax>50°C ±2°C or Vmax>1.6 V/Cell
  Important note: Due to the erratic charge behavior of NiMH and NiCad batteries when first placed on charge there is a delay of up to 15 minutes before an accurate charge termination can be read. In worst case a battery can be taken off the charger and reattached, and charged for 15 minutes before the "charged" light comes on again. In addition, new packs should be charged and discharged several times before they "settle in" to a predictable charging condition.
Input Frequency 50-60 Hz
Battery type Ni-Cd/Ni-MH Battery
Style Desktop
Output power 60W maximum
Ripple <100 mA
Output options included 3 pin connector standard, others on request
This is commonly called a XLR connetor
Plug wiring Pin 3 NTC thermistor (yellow/striped wire if the connector is opened)
Pin1 Positive charge (brown wire if the connector is opened)
Pin 2 Negative charge, thermistor (blue wire if the connector is opened)
(Note, over the years the wire colors have changed, but the connector pinout has remained constant.)
Thermistor NTC type, 10K and B=3950
Weight 650 grams, 0.65 kg, 1.4 lb
Cooling Natural convection, no fan
Efficiency >80% at maximum load
Size 170 x 71 x 51 mm, 6.7 x 2.8 x 2 inches
Environment -10°C to +40°C operating, -40°C to +70°C storage
Temperature rise <40°C rise on case under any line voltage and maximum rated load
Vibration, Impact 5mm, 50Hz, 600 Seconds, 1 meter drop 3 times
Protections Reverse Polarity, Short circuit protection
Safety CE marked, Double insulated, indoor use
Due to low sales volumes the factory has opted not to renew the following TUV listings based on UL310, IEC335-2-29. The design has not changed.
MTBF 10,000 hours by MIL-STD calculation
HiPot, ESD Hi-Pot 3000 V, 1 minute, ESD 8000V
LED Indications   Power on separate LED Charging Red
Charged/Trickle Charging or Idle Green
Error (usually reverse polarity or thermistor not connected) Blinking
Protections Short circuit protection
Reverse polarity protection
AC power cord IEC removable 6 foot cord with USA two prong plug

Thermistor This charger will work only if you have a thermistor attached to the pack. The thermistor monitors the temperature and detects when the battery is fully charged. When the current stops charging and starts to generate oxygen ions (which are recombined at the electrodes) more heat is generated. Many NiCad and NiMH battery packs already have the thermistor installed, the NTC type, 10K and B=3950 is the industry standard. If you don't have a thermistor in the pack you need to add one. The bead of the thermistor needs to be in thermal contact with the battery. Good results will be obtained if it is taped to one of the cells, where it will detect if that cell is full. Any cells that are not yet full will be topped up during the subsequent trickle charging stage. Electrically the thermistor is connected between the thermistor terminal of the battery charger connector and the negative terminal, but it doesn't matter which side of the thermistor is attached to the thermistor terminal. A voltage is applied through this terminal and the resistance is measured by the charger by detecting the amount of current flowing through the thermistor to the negative terminal.


OEM Battery Chargers Inexpensive desk top Nicad and NiMH Battery Charger with peak charge control circuit, universal AC input version.

OEM Power SuppliesSingle LED changes color to indicate state of charge.

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