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Zodiac PA2099 12V Ni-MH Compatible Battery 1100mAh

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From $46.99 USD $57.99
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Fits Zodiac PA2099, PA4099, PA5099, PA5499 portable radios — direct replacement for OEM Ni-MH pack.
12V 1100mAh chemistry delivers steady voltage under sustained transmit load without sag-induced cutoff.
Connector orientation matches OEM slot; gold contacts require firm seating into dock cradle for BMS recognition.
We bench-tested against PA5099 charger dock — pack accepts charge on first insertion, voltage ramps linear, no fault LED.
On first insertion into the charger dock, wipe the battery gold contact strip with a dry cloth and reseat firmly — the Zodiac platform requires clean contact for BMS handshake before the dock LED turns green.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

12V

Amp

1100mAh

Zodiac PA2099 / PA4099 / PA5099 / PA5499 Series — 12V Ni-MH Replacement Battery

This is a 12V 1100mAh Ni-MH replacement battery for Zodiac two-way radios including the PA2099, PA4099, PA5099, and PA5499. It slots into the same battery compartment as the original pack and connects to the same charging contacts. Voltage and chemistry match the OEM specification exactly.

  • PA2099 / PA4099 / PA5099 / PA5499 platform fit: These Zodiac models share the same 12V Ni-MH battery format, contact layout, and BMS handshake protocol. One replacement pack covers the full series without adapters or modifications.
  • Bench tested on actual hardware: We ran this pack through charge and transmit cycles on a Zodiac-series radio. The BMS accepted the dock handshake on first insertion, and voltage held steady under repeated PTT press load spikes throughout testing.
  • First-cycle contact check: Ni-MH cells ship at partial charge and the contact strip can carry a fine oxide film from storage. Before first charge, wipe the gold battery contacts with a dry cloth, seat the pack firmly in the dock, and confirm the charge indicator activates — this clears any contact resistance that prevents the dock from reading the pack correctly.

Why the PA2099 cuts out mid-transmission on a freshly charged pack

Ni-MH cells have a steeper voltage sag curve than Li-ion under transmit current spikes. When you press PTT, the radio draws a sharp burst of current that can momentarily pull cell voltage below the BMS low-voltage cutoff threshold — even when the pack reads as fully charged at rest. This is more likely if the pack has been stored discharged for an extended period, as internal impedance rises. A full conditioning cycle — one complete charge followed by normal use to depletion — lowers cell impedance and reduces the sag response.

Bar indicator drops one bar immediately after inserting a new pack

New Ni-MH cells leave the factory at storage voltage, not full charge. The radio reads that resting voltage and maps it to one fewer bar on the indicator — this is normal voltage-threshold behaviour, not a fault with the pack. Place the battery in the charger dock before use and let it complete a full charge cycle. Once the dock confirms charge complete and the pack reaches rated voltage, the bar indicator will reflect actual capacity correctly.

Compatible Models

PA2099 PA4099 PA5099 PA5499 PA6099

Technical Specifications

Voltage12V
Amp Hours1100mAh
Capacity1100mAh
Rate13.2Wh
Net Weight220.6g /7.78 oz
Gross Weight370.6g /13.07 oz
Approximate Weight370.6g /13.07 oz
Dimension 109.74 x 55.63 x 21.86mm

Product Highlights

  • Brand: Zodiac
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Zodiac PA2099 charger dock blinks a fault light after I insert the new battery — it never starts charging. What's wrong?

This happens when the pack voltage is below the dock's acceptance threshold, which is common on batteries shipped in storage state. Remove the pack, wipe the gold contact strip with a dry cloth, and firmly reseat it — a poor contact reads the same as an undervoltage condition to the dock. If the fault light persists, check resting voltage across the contacts with a multimeter; the pack needs to read at least 10V for most Ni-MH docks to begin a charge cycle.

The radio cuts out mid-transmission after a few hours of use — the battery felt fully charged when the shift started. Is the pack failing?

This is voltage sag under sustained RF output, not a dead pack. Ni-MH cells lose voltage faster than Li-ion during repeated high-current PTT bursts, and the BMS trips if voltage dips below its cutoff threshold. Run one full conditioning cycle — charge to completion, use until the radio shuts down, then recharge fully — this reduces cell impedance and tightens the voltage response under transmit load.

After the radio sat unused for two weeks with this battery installed, it won't power on at all — the dock shows no activity either.

Ni-MH packs self-discharge faster than Li-ion, and two weeks of standby inside a radio can pull cell voltage below the BMS recovery threshold, triggering a lockout. Remove the pack from the radio and connect it directly to the dock charger outside the device — some docks have a recovery or trickle mode that activates only when the pack is inserted alone. If the dock begins a trickle charge, let it run to completion; voltage should recover above 10.8V and the BMS will re-initialise normally.

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