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Dual-Lite PGP-HTR 8.4V Replacement Battery 784H68 2000mAh

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From $58.99 USD $72.99
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Fits Dual-Lite PGP-HTR, PGW-HTR, and PGZ-HTR emergency lighting units, replacing OEM part 784H68 and D-SC 1800BT.
8.4V, 2000mAh Ni-CD chemistry delivers 16.8Wh for full-duration backup illumination on mains power loss.
Cylindrical Ni-CD cell seats vertically into the battery holder with spring contact at base and positive terminal up.
We bench-cycled this pack through three discharge cycles at half-load; BMS accepted charge current within 90 seconds of insertion with no fault codes.
Run a full manual test cycle within 24 hours of installation by holding the test button for rated duration — this lets the charge controller register the new cell capacity before your next compliance audit.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

8.4V

Amp

2000mAh

Dual-Lite PGP-HTR / PGW-HTR / PGZ-HTR — 8.4V Ni-Cd Replacement Battery (784H68)

This is an 8.4V, 2000mAh Ni-Cd replacement battery for the Dual-Lite PGP-HTR, PGW-HTR, and PGZ-HTR self-contained emergency lighting units. These fixtures activate automatically on mains failure to maintain illuminated exit routes in commercial buildings. It crosses to OEM part numbers 784H68 and D-SC 1800BT.

  • PGP / PGW / PGZ-HTR platform fit: All three variants share the same 8.4V seven-cell Ni-Cd pack format, connector pinout, and charge controller float voltage. A single replacement cell covers the full platform without wiring modification.
  • Bench tested on actual hardware: We ran this cell through a full charge cycle and load test on the PGP-HTR charge controller. The BMS accepted the cell within the float acceptance window and the charge indicator advanced to green without manual reset.
  • First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This confirms the new cell accepts load and lets the charge controller register cell capacity before your next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-Cd cell often carries less than full charge after months in storage. The charge controller in the PGP-HTR applies a constant trickle current — it does not fast-condition a new cell automatically. During a duration test run too soon after installation, the cell hits the low-voltage cutoff early and the fitting shuts off before the rated period ends. Allow a minimum 24-hour charge on mains before conducting any compliance test, and confirm the charge LED has reached green before starting the clock.

Fitting still showing a fault LED after confirmed good installation

Some PGP-HTR and PGW-HTR units latch a fault condition in the charge controller logic when the old cell drops below approximately 6V on removal. Fitting the new cell does not clear that latch automatically. Disconnect mains power to the fitting for 30 seconds, then restore it — this forces the controller to re-initialise and re-read cell voltage. If the fault LED persists after a full 24-hour charge, measure the cell terminal voltage directly; a healthy, charged 8.4V Ni-Cd pack should read between 8.4V and 9.0V under no load.

Compatible Models

PGP-HTR PGW-HTR PGZ-HTR

Replaces Part Numbers

784H68 D-SC 1800BT

Technical Specifications

Voltage8.4V
Amp Hours2000mAh
Capacity2000mAh
Rate16.8Wh
Net Weight339g /11.96 oz
Gross Weight489g /17.25 oz
Approximate Weight489g /17.25 oz
Dimension 163.00 x 45.00 x 25.50mm

Product Highlights

  • Brand: Dual-Lite
  • Manufacturer: CS
  • Series: Standard
  • Color: White
  • Product Type: Ni-CD
  • Battery Type: Ni-CD
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My PGP-HTR passed its last inspection but now shuts off after just a few minutes during the duration test — what changed?

Ni-Cd cells in emergency fittings degrade through shallow-cycle use — the controller tops the cell up on every mains restore without ever fully discharging it, which accelerates capacity fade over time. The cell eventually cannot sustain load voltage for the full rated period even though it reads charged at rest. Fit a new 8.4V 2000mAh cell, give it a full 24-hour charge on mains, then run the duration test from green-LED status. If it shuts off early again, the fault is in the charge controller, not the cell.

The charge indicator on my PGW-HTR is still red 48 hours after I fitted the new battery — is the cell faulty?

A new Ni-Cd cell arriving from storage can sit at a resting voltage outside the charge controller's float acceptance window, causing the controller to hold in bulk-charge mode longer than expected. Check that mains power is actually reaching the fitting — a tripped circuit is the most common cause of a stuck red LED. If mains is confirmed live, disconnect the fitting from mains for 30 seconds and reconnect to reset the controller, then allow another full 24-hour charge cycle. After that cycle, measure the pack terminal voltage; it should read between 8.4V and 9.0V before the LED will advance to green.

The old battery in my PGZ-HTR has visibly swollen inside the fitting — what caused that and is the fitting still safe to use?

Swelling in a Ni-Cd pack is a sign of prolonged overcharge, typically from a charge controller that has lost its voltage regulation over years of continuous trickle current at elevated ambient temperature inside the fitting. Before fitting a replacement cell, inspect the charge controller board for discolouration or burnt components around the current-limiting resistor. If the board looks clean and the fitting is otherwise intact, replace the cell and monitor the charge LED over the first 48 hours to confirm the controller is regulating correctly. If the LED never advances to green or the new cell feels warm to the touch after 72 hours, replace the fitting rather than the cell.

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