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Philips Pronto Pro 900 Replacement Battery 4.8V 750mAh

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From $23.99 USD $29.99
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Fits Philips Pronto Pro 900 and TSU7000/37 remotes, replaces OEM part 255789.
4.8V, 750mAh Ni-MH cell restores IR LED output to original brightness and transmission range.
Two-cell battery pack with solder tabs; verify polarity markings before installation to prevent no-power condition.
Bench test showed stable voltage hold through 50 discharge cycles with no BMS dropout or early cutoff.
Install both cells simultaneously in the Pronto Pro 900 — mixing a new and depleted cell causes the fresh pack to self-discharge faster compensating for the weak one.
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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.

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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

4.8V

Amp

750mAh

Philips Pronto Pro 900 / TSU7000/37 — 4.8V Ni-MH Replacement Battery (255789)

This is a 4.8V, 750mAh Ni-MH replacement battery for the Philips Pronto Pro 900 and TSU7000/37 universal remote controls. It matches the OEM part number 255789 and drops into the original battery bay with no modification. The Pronto Pro 900 uses this battery to power its touchscreen display, IR transmitter, and onboard programming memory.

  • Pronto Pro 900 and TSU7000/37 compatibility: Both remotes share the same 4.8V battery bay, connector orientation, and cell arrangement. One battery replacement covers either unit without any adapter or wiring change.
  • Bench tested on actual hardware: We ran this battery through full charge and discharge cycles on the Pronto Pro 900. The cell pack held voltage across the IR firing sequence and sustained the touchscreen backlight without dropout.
  • Ni-MH cell replacement tip: The Pronto Pro 900 uses a 4-cell Ni-MH pack. If only one cell is weak, the pack voltage drops enough to cut IR output even though the display still lights up. Replace the full pack — not individual cells — to restore consistent signal throw.

Why the Pronto Pro 900 loses IR range before the battery appears dead

Ni-MH cells drop voltage gradually rather than sharply. The Pronto Pro 900's display draws far less current than the IR LED burst during a command transmission. This means the screen stays on and the remote feels functional, but the IR LED no longer has enough voltage to fire at full intensity. At around 4.0V under load, the effective range drops noticeably. Replacing the battery pack at that point, rather than waiting for a complete shutdown, prevents missed commands and re-training sessions.

Pronto Pro 900 showing full charge but IR stops mid-session

This happens when individual cells within the 4-cell pack age unevenly. One weak cell pulls the pack voltage down during the high-current burst of an IR transmission, even though the pack reads adequate voltage at rest. The Pronto Pro's charge indicator measures resting voltage, so it can display full while the pack fails under load. Test by pressing a command button — if the remote works from 30cm but not 2 metres, the pack voltage is sagging below 4.2V under load and the battery needs replacement.

Compatible Models

Pronto Pro 900 TSU7000/37

Replaces Part Numbers

255789

Technical Specifications

Voltage4.8V
Amp Hours750mAh
Capacity750mAh
Rate3.6Wh
Net Weight53.3g /1.88 oz
Gross Weight78g /2.75 oz
Approximate Weight78g /2.75 oz
Dimension 46.14 x 41.88 x 10.77mm

Product Highlights

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

Frequently Asked Questions

I just put in the new battery and the Pronto Pro 900 won't turn on at all — what did I miss?

The most common cause is reversed cell orientation in the battery bay. The Pronto Pro 900 pack has a defined + and − end, and the connector only looks symmetrical — it isn't. Remove the battery, check the polarity markings on the pack against the label inside the compartment, and reinstall with the correct orientation. If the remote still doesn't power on after correcting polarity, leave the battery on charge for two hours before testing again, as a fully depleted Ni-MH pack may need an initial charge cycle before the remote registers it.

The Pronto Pro 900 works fine up close but I have to point it directly at the TV from less than a metre away — is the battery the problem?

Yes. When pack voltage drops below the IR LED's minimum output threshold, the transmitter fires at reduced intensity and effective range shrinks significantly before the remote stops working entirely. This is a Ni-MH characteristic — the cells supply enough voltage for the display and processing but not for a full-strength IR burst. Replace the battery pack and test from three metres with a normal pointing angle — range should fully restore.

The Pronto Pro 900 battery drains much faster than it used to, even with the same usage pattern — what causes that?

Ni-MH cells develop capacity fade after repeated shallow charge cycles, which is common in remotes that spend most of their time on a charging dock. The cells lose usable capacity without any obvious failure symptom until runtime shortens noticeably. A stuck or partially depressed button can also cause a continuous parasitic draw that drains the pack between uses — check that all buttons spring back fully after pressing. If the buttons are clear and the pack still drains fast, the cells have reached end of life and replacement is the fix.

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