We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular Ni-MH battery pack, 50.2 by 42.8 by 14.3mm, pale wrap with label showing 3.6V 2000mAh

Estry

Estry standard battery 3.6V 2000mAh for Tyro TY 55.00.56 HR3AA

SKU CH-0WH9-SR93G

Replacement Ni-MH battery pack delivers 3.6 V and 2000 mAh for Tyro TY 55.00.56 HR3AA devices

  • Battery pack size1 Year
  • Details3.6
  • Exact-fit replacement for Tyro TY 55.00.56 HR3AA
  • 6V 2000mAh Ni-MH chemistry delivers 7.2Wh runtime
  • Built-in overcharge, over-discharge, over-voltage and short-circuit protection
  • Certified to ISO 9001, RoHS, CE, UN38.3 and MSDS standards
  • Compact 50.2 x 42.8 x 14.3mm pack weighs 130.0g

Direct replacement for Tyro TY 55.00.56

This Estry Ni-MH pack matches the original HR3AA specifications exactly. It delivers 3.6V and 2000mAh capacity in a 50.2 x 42.8 x 14.3mm form factor weighing 130.0g. Built-in protection guards against overcharge, over-discharge, over-voltage and short circuits. Certified to ISO9001, RoHS, CE, UN38.3 and MSDS standards.

Upgrade from depleted or aging original cells

When the factory pack no longer holds a full day's charge, this replacement restores runtime to the original 7.2Wh rating. The jump is worth it if the device shows reduced operating time or unexpected shutdowns under load. No firmware update or hardware modification is required for the swap.

Powers the Tyro terminal through a standard shift

The 2000mAh capacity comfortably handles typical daily transaction volumes and standby periods. Runtime shortens under continuous high-draw peripherals or in cold environments where Ni-MH chemistry loses efficiency. Not suited for devices requiring higher voltage, lithium chemistry or a different physical footprint.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $18.99
Pricier than about 75% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameNi-MH
Model name2,000 mAh
In the box
Battery pack size1 Year

Questions about this item

What are the exact dimensions I need to clear for the 50.2 x 42.8 x 14.3 mm pack in my Tyro TY 55.00.56?

The replacement measures 50.2 mm long, 42.8 mm wide and 14.3 mm thick, matching the original HR3AA footprint so it slots into the existing compartment without modification.

How do I install the 3.6 V 2000 mAh Ni-MH pack, and what step do people skip?

Disconnect power, remove the old pack, align the connector polarity exactly as shown on the label, press the new pack firmly until the latch clicks, then run a full charge cycle before first use.

When will the 7.2 Wh battery need replacing and how do I tell?

Expect roughly one year of daily cycles; replace when runtime drops below half the original 2000 mAh capacity or the pack no longer holds a full 3.6 V charge after a complete cycle.

More in Household Batteries & Chargers

Similar items