Welch Allyn BATT11 Battery for Connex ProBP 3400

The BATT11 is the OEM-style lithium‑ion battery designed for the Welch Allyn Connex ProBP 3400 Digital Blood Pressure Device. It delivers up to 100 readings per charge in a compact, lightweight form factor—ideal for busy clinics and mobile care.

Key specs

Part number	BATT11
Compatible device	Welch Allyn Connex ProBP 3400 Digital Blood Pressure Device
Voltage	3.7 V DC
Capacity	2100 mAh
Chemistry	Lithium‑ion (rechargeable)
Dimensions	2.8 × 0.8 × 0.8 in (approx. 7.1 × 2 × 2 cm)
Weight	0.1125 lb
Typical runtime	Up to 100 readings per charge (varies by cuff size, patient factors, and measurement frequency)

When to choose this battery

• You use a Connex ProBP 3400 and need a direct replacement or a spare for continuous workflow.
• The device shows reduced runtime, frequent low‑battery alerts, or the battery is damaged/swollen.
• You want a lightweight, quick‑swap power source for rounding or mobile screening.

Avoid if you need batteries for Welch Allyn 3.5 V otoscope/ophthalmoscope handles (e.g., 71960/72200/72300 families) or other blood pressure models. Always confirm the device label and part number before ordering.

Installation (quick guide)

1. Power off the ProBP 3400.
2. Open the battery compartment per the device manual.
3. Remove the old battery. Inspect contacts for debris; wipe gently if needed with a lint‑free cloth.
4. Align the BATT11 contacts and insert until fully seated; close the door securely.
5. Place the device on the approved charger and charge fully before first use.

Charging and runtime tips

• Use only Welch Allyn–approved chargers or cradles to ensure proper charging and device safety.
• Top up between sessions rather than running to empty; avoid frequent deep discharges to extend service life.
• Keep a second BATT11 charged for shifts with high patient throughput.
• Actual readings per charge can drop with repeated back‑to‑back measurements, larger cuffs, or cuff leaks—address leaks and allow brief rests between readings when possible.

Care, storage, and safety

• Store cool and dry: about 32–86°F (0–30°C), 30–70% RH. For storage over 1 month, leave at ~40–60% charge.
• Do not crush, puncture, short the contacts, or expose to heat or liquids. Do not autoclave.
• Retire and replace the battery if it shows swelling, unusual warmth, leakage, or severely reduced runtime.
• Recycle through approved e‑waste or battery programs; follow local regulations for lithium‑ion disposal.

Alternatives and compatibility notes

• Not cross‑compatible with Welch Allyn 3.5 V instrument handle batteries (e.g., 71960) or legacy NiCd/NiMH packs (e.g., 72200/72300).
• If your device is not the Connex ProBP 3400, check its manual for the correct battery part number.
• Consider a spare BATT11 for continuous operation while the other charges.

Troubleshooting

• Device won’t power on: Reseat the battery, confirm charge, and try a known‑good charger or cradle.
• Short runtime: Fully charge, inspect for cuff leaks, reduce repeated immediate measurements, and replace the battery if capacity remains low.
• Charging issues: Check charger contacts and cables; use only compatible Welch Allyn charging hardware.

FAQ

How many readings can I expect per charge?

Up to about 100 readings under typical conditions. Actual results vary with cuff size, patient factors, and how quickly you repeat measurements.

Can I charge the battery while it’s in the device?

Yes—if you’re using a Welch Allyn–approved charging cradle that charges the device. Otherwise, charge following the device’s instructions.

How do I know it’s time to replace the battery?

Noticeably shorter runtime, difficulty holding charge, swelling, or overheating during charge/use are signs to replace the BATT11.

Is this the right battery for otoscopes or ophthalmoscopes?

No. The BATT11 is for the Connex ProBP 3400. Welch Allyn 3.5 V instrument handles use different batteries (e.g., the 71960 family).

Any special shipping or disposal considerations?

As a lithium‑ion battery, it may be subject to shipping and disposal regulations. Recycle through approved programs and follow local rules.