Bartec Benke 6728-70 Replacement Battery 4.8V 2000mAh
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Bartec Benke 6728-70 Replacement Battery 4.8V 2000mAh - 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
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Disclaimer
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Bartec Benke 6728-70 Replacement Battery 4.8V 2000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
4.8V
Amp
2000mAh
Bartec Benke 6728-70 Serie C — 4.8V Ni-MH Replacement Battery (310722)
This is a 4.8V 2000mAh Ni-MH replacement battery for the Bartec Benke 6728-70 Serie C surveying and testing instrument. It replaces OEM part numbers 310722, 91506201, and 04Z14500-2201. The pack matches the original voltage rail and connector so it seats directly into the battery compartment without modification.
- 6728-70 Serie C compatibility: The Serie C instruments in this line share a common 4.8V four-cell NiMH architecture with a matched connector and BMS handshake. Swapping to a different voltage or cell count causes the instrument to fault during initialisation, so this pack stays within the original 4.8V specification.
- Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a 6728-70 Serie C unit. The BMS accepted the pack on first contact, voltage held steady under sustained sensor load, and the charge circuit terminated cleanly at capacity without thermal event.
- First-use calibration on the 6728-70: After installing, run a full calibration cycle through the instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings to appear during the first measurement session even when the pack is fully charged.
BMS cutoff when the probe module initialises on the 6728-70 Serie C
When the instrument powers up a connected probe, there is a brief current spike as the probe's internal circuitry initialises. On a degraded or deeply discharged original pack, this spike is enough to trip the BMS undervoltage cutoff and shut the instrument down immediately. A fresh Ni-MH pack at full charge presents lower internal resistance, so the voltage does not sag enough to trigger cutoff during that startup transient. If the issue persists after fitting this pack, verify the probe connector pins are clean — a resistive connection amplifies the voltage drop at the same current draw.
Pack will not charge after months sitting unused in the carry case
Ni-MH cells self-discharge over time. If a pack sits unused for several months it can drop below the threshold the charger uses to detect a valid cell, and the charge cycle will not start. Place the pack in the instrument, power on, and check whether the display registers any voltage reading — this alone can confirm whether the BMS has locked out completely. If the charger still does not initiate, a brief trickle from a compatible external Ni-MH charger at 100mA for 10–15 minutes can bring the pack back above 4.0V, at which point the instrument's onboard charger will take over normally.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Bartec Benke
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The 6728-70 Serie C turns off the moment I start a logging session, even though the battery indicator looked fine at startup — what's happening?
Sustained sensor load during active logging draws more current than the instrument pulls at idle, and if the pack's internal resistance is high enough, voltage sags under that load and triggers the BMS cutoff. The display shows a good charge at startup because voltage is measured at rest, not under load. A fresh Ni-MH pack with low internal resistance holds voltage stable across the full logging draw. Fit the new pack, run the calibration cycle from the instrument menu, then start a test log session to confirm the cutoff does not repeat.
My readings are resetting or jumping partway through a measurement sequence on the 6728-70 — the battery isn't dead, so why is this happening?
This is a voltage dropout issue, not a full BMS cutoff. The instrument's processor briefly loses stable voltage during a high-draw measurement step — probe switching, backlight pulse, or data write — and the internal logic resets without fully powering down. It looks like a software glitch but the cause is pack voltage falling below the processor's minimum during that combined draw. Replacing the pack eliminates the dropout if the original cells have capacity-faded. After fitting the new pack, confirm supply voltage holds above 4.2V during active measurement by checking the diagnostic screen if the instrument has one.
The 6728-70 Serie C powers on fine but shuts down as soon as I connect it to the PC for data transfer — is this a USB problem?
It is not a USB fault. USB data transfer activates the communication interface while the instrument is still powering its sensor and display, and that combined draw is enough to collapse voltage on a weakened pack. The BMS cuts the output to protect the cells and the instrument shuts off. We saw this exact behaviour on the bench with a depleted original pack — fitting a fully charged replacement with adequate capacity stopped the cutoff immediately. Charge this pack fully before attempting the transfer, and use a short, direct USB cable to avoid any additional voltage drop at the connector.
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