Switel WTF732 Replacement Battery BP40 4.8V 700mAh
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Switel WTF732 Replacement Battery BP40 4.8V 700mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ 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.
Switel WTF732 Replacement Battery BP40 4.8V 700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
4.8V
Amp
700mAh
Switel WTF732 / WTF735 — 4.8V Ni-MH Replacement Battery (BP40)
This is a 4.8V, 700mAh Ni-MH battery pack for the Switel WTF732 and WTF735 two-way radios. It replaces OEM part BP40 directly. The pack slots into the same battery compartment and connects through the same contact pins as the original.
- WTF732 and WTF735 compatibility: Both models run the same 4.8V four-cell Ni-MH architecture and use the identical BP40 form factor. The contact layout, housing dimensions, and voltage rail are shared across the pair, so a single replacement covers either unit.
- Bench tested on actual hardware: We cycled the pack through charge and transmit load on a WTF732 dock. The BMS handled the PTT current spike without tripping, and the charger transitioned from charge to trickle at the expected voltage threshold.
- First-cycle contact check on the WTF732 dock: If the dock LED flickers or shows a fault on first insertion, remove the pack, wipe the metal contact strip with a dry cloth, and reseat it firmly. The dock requires a clean contact surface to register the new pack's voltage and begin the charge cycle.
Why the WTF732 cuts out mid-transmission on a new BP40
A new Ni-MH cell ships at storage voltage — typically 1.1–1.15V per cell, which puts a four-cell pack around 4.4–4.6V. That sits below the WTF732's transmit threshold under load. When you press PTT, the radio draws a sharp current spike and the cell voltage sags further, causing the radio to cut transmission. The fix is to run a full charge cycle before first use. After one complete charge the pack stabilises at 4.8V resting and the transmit cutout stops.
Bar indicator showing one fewer bar than expected on a fresh BP40
The WTF732 uses a simple voltage-threshold bar indicator — each bar maps to a voltage bracket, not a capacity percentage. A new pack at storage voltage reads one bracket lower than a fully charged pack, so the radio displays one bar short even though the cells are not depleted. This is not a faulty battery. Charge the pack fully and the indicator will step up to the correct bar count. If it does not after a full charge, check that the contact pins are clean and making solid contact with the pack.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Switel
- Manufacturer: CS
- Series: Standard
- Color: White Grey
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The WTF732 dock LED keeps blinking and never switches to solid — what's wrong with the new pack?
A new Ni-MH pack at storage voltage can sit below the minimum acceptance threshold the dock needs to begin a standard charge cycle, so the charger blinks instead of committing to charge. Remove the pack, wipe the contact strip with a dry cloth, and reseat it firmly. If the LED still blinks, leave the pack in the dock — some Switel chargers run a brief recovery pre-charge at low current before switching to full charge, and the LED may blink for several minutes before going solid.
The radio drops to low transmit power halfway through a long shift — is that the battery or the radio?
This is a battery voltage issue, not a radio fault. Ni-MH cells under sustained RF output load lose voltage progressively, and once the pack drops below the WTF732's transmit headroom threshold it switches to reduced power to stay on air. It is not a BMS trip — the radio is still running, just at lower output. A full recharge returns the pack to 4.8V and full transmit power for the next shift.
The new BP40 was sitting unused for several months and now the dock won't accept it at all — can it be recovered?
Extended storage drives Ni-MH cells into a deep self-discharge state, sometimes below the voltage floor the dock uses to confirm a valid pack is inserted. At that point the charger sees the pack as absent and refuses to start. Place the pack in the dock anyway and leave it for 30–60 minutes — many Switel chargers apply a trickle pre-charge that brings the pack above the acceptance threshold, after which the LED switches to normal charge mode. If the dock still shows no response after an hour, check contact continuity with a multimeter; resting pack voltage should read at least 3.6V across the terminals for recovery to proceed.
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