Dogtra DC-7 Transmitter 1100NC Replacement Battery 7.2V 300mAh

Dogtra Transmitter 1100NC / 1200NC Series — 7.2V Ni-MH Replacement Battery (DC-7)

This is a 7.2V, 300mAh Ni-MH rechargeable battery for the Dogtra handheld transmitter units used in remote dog training collar systems. It fits the Transmitter 1100NC, 1200NC, 1202NC, 1400NCP, and over a dozen additional Dogtra transmitter models sharing the same DC-7 form factor. When the original cell loses capacity and the transmitter dies mid-session, this is the direct swap.

• 1100NC / 1200NC transmitter platform: These handheld units share a common battery bay, connector orientation, and voltage requirement. The DC-7 cell format is used across the full range because Dogtra standardised the transmitter housing across multiple collar systems — one battery works across all of them without modification.
• Bench tested on actual hardware: We cycled this cell through the transmitter's charge circuit and confirmed the protection circuit trips correctly at the low-voltage threshold, preventing cell reversal during deep discharge. Charge acceptance matched spec across multiple cycles.
• Transmitter storage between training seasons: Ni-MH cells left fully discharged for months will self-discharge past the point where the charger recognises them. Store the transmitter with a partial charge — around 40–60% — if it won't be used for more than a few weeks.

Why the Dogtra transmitter stops responding mid-session even with charge showing

Ni-MH cells age by losing usable capacity, not voltage. An aged cell can read 7.2V at rest but collapse under the transmitter's RF transmission load, triggering the low-voltage cutoff before the indicator shows empty. The transmitter appears to shut off randomly, but the cell is simply unable to sustain current during the brief power spike of each button press. A fresh 300mAh DC-7 cell restores the current headroom the transmitter needs to complete each command signal without brownout.

Charger shows complete but transmitter powers off immediately after removing from charger

This happens when a heavily degraded Ni-MH cell surface-charges — the outer layers absorb enough energy to satisfy the charger's delta-V termination logic, but the core cell capacity is effectively gone. The transmitter runs for seconds and dies. The fix is not re-charging — the cell needs replacement. After fitting a new DC-7 cell, run a full charge cycle and confirm resting voltage holds above 7.0V before use.