Welch Allyn 72200

Welch Allyn 72200 3.5 V NiCd Battery

The Welch Allyn 72200 is a 3.5 V, 620 mAh nickel-cadmium (NiCd) rechargeable battery for select Welch Allyn 3.5 V power handles, including 71000-A, 71000-C, and 71670. It provides dependable power for otoscope and ophthalmoscope handles used in everyday clinical exams.

At a glance

• Voltage: 3.5 V
• Capacity: 620 mAh (NiCd)
• Fits handles: 71000-A, 71000-C, 71670
• Use cases: Otoscope and ophthalmoscope 3.5 V handles
• Not compatible with: Lithium-ion USB/charging handles

When to choose the 72200

• Choose if you use legacy 3.5 V Welch Allyn rechargeable handles listed above and need a direct replacement.
• Choose if your clinic prefers NiCd for predictable voltage under load and proven durability in varied temperatures.
• Avoid if you require longest possible runtime per charge or quick charging—consider a NiMH 72300 battery or a lithium-ion handle instead.

Runtime and charging expectations

• Charge time: About 12–16 hours on standard Welch Allyn chargers/stands.
• Typical use: ~1–2 hours of continuous light output with halogen heads; longer with LED conversion heads and intermittent use.
• New batteries may reach full performance after 2–3 full charge/discharge cycles.

Installation guide

1. Power off and remove the instrument head.
2. Unscrew the handle base/cap and slide out the old battery.
3. Insert the 72200 with the button-top oriented per your handle’s markings (check polarity icons inside the handle).
4. Reassemble the handle and place it on the compatible charger until fully charged.

Care, conditioning, and safety

• Conditioning: To minimize NiCd voltage depression, allow a near-full discharge and full recharge about once per month.
• Daily use: Avoid leaving the battery on a trickle charger for weeks at a time; remove and use the handle periodically.
• Storage: Store cool and dry; if unused for >3 months, recharge before next use.
• Contacts: Keep terminals clean and dry for best performance.
• Safety: Do not short, crush, incinerate, or open the battery. Use only Welch Allyn-approved chargers/handles.
• Disposal: NiCd contains cadmium. Recycle through approved medical/battery recycling programs; follow local regulations.

Alternatives and compatibility notes

• NiMH 72300: Typically offers longer runtime and reduced memory effect; check your handle manual for compatibility.
• Lithium-ion handles: Separate handle systems with faster charging and longer runtime; 72200 does not fit these handles.
• Bulb type impact: LED heads draw less power than halogen, extending runtime regardless of battery chemistry.

Quick comparison

Option	Chemistry	Runtime	Notes
72200 (this item)	NiCd	Baseline	Direct fit for 71000-A, 71000-C, 71670
72300	NiMH	Longer vs 72200	Check handle compatibility
Lithium-ion handle	Li-ion	Longest	Different handle; not cross-compatible with 72200

Troubleshooting

• Dim light after full charge: Clean contacts; confirm correct polarity; try a known-good bulb/head; replace battery if >3–4 years old or if capacity is noticeably reduced.
• Won’t charge: Verify charger and handle are compatible with NiCd; inspect charger contacts; try another charging well if available.

FAQ

How long will the 72200 last before it needs replacement?

With regular clinical use and proper conditioning, many users replace NiCd packs every 2–4 years. Replace sooner if runtime drops significantly or charging becomes erratic.

Does it work with LED otoscope/ophthalmoscope heads?

Yes. LED heads typically draw less power than halogen, so you may see longer runtime.

Can I use any charger?

Use Welch Allyn-approved 3.5 V charging handles or desk chargers designed for NiCd/NiMH packs. Avoid unverified third-party chargers.

Should I fully discharge NiCd batteries?

Occasional near-full discharge (about monthly) can help reduce voltage depression. Avoid frequent deep discharges that can shorten overall life.

Is the 72200 interchangeable with the 72300?

Not always. Many handles support both, but check your handle’s manual. The chemistries differ and some older handles specify one type.