About this replacement
Philips Dameca Siesta i Breasy — 24V Ni-MH Replacement Battery (20*H-AA2000B)
This is a 24V, 2000mAh Ni-MH battery for the Philips Dameca Siesta i Breasy respiratory therapy device. It replaces OEM part numbers 20*H-AA1500B and 20*H-AA2000B. When mains power is unavailable, this battery keeps the device running on portable power during therapeutic use.
- Dameca Siesta i Breasy platform fit: The Siesta i Breasy runs a 24V bus with a BMS handshake specific to Ni-MH cell arrays. This battery matches that voltage rail and connector format so the device controller recognises the pack correctly at startup.
- Bench tested on actual hardware: We ran charge and discharge cycles on this pack and confirmed the BMS handshake completes without fault codes. Cell voltage balanced across the array within the first two cycles, and the charge circuit reached full capacity without triggering a premature termination flag.
- Post-swap startup protocol: After installing this battery, allow the Siesta i Breasy to complete its full power-on self-test without interruption. Medical devices like this run a BMS verification sequence at boot — cutting power during that window logs a persistent battery fault that won't clear until the next complete reboot cycle.
Why the Siesta i Breasy alarms low battery immediately after a confirmed full charge
The Siesta i Breasy BMS stores charge acceptance data from the previous cell. A new Ni-MH pack hasn't yet built a charge profile the BMS recognises as meeting its internal threshold, so the controller flags it as undercharged even when the cells are full. This is a learn-cycle issue, not a cell defect. Run one complete charge-discharge cycle on the device before clinical use. After that first cycle, the BMS updates its reference and the alarm clears.
Device not completing boot sequence after battery sat in storage
Ni-MH cells self-discharge during storage at roughly 1–2% per day at room temperature. A pack that has sat for several weeks can drop below the Siesta i Breasy's BMS recovery threshold — typically around 18–19V on a 24V Ni-MH array — and the device will not reach the boot sequence. Connect the device to mains power and allow the charge circuit to bring the pack above 21V before attempting to power on from battery alone. Do not interrupt this pre-charge period.