NiKon DTM-302 Replacement Battery 7.2V 3500mAh Ni-MH
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NiKon DTM-302 Replacement Battery 7.2V 3500mAh Ni-MH - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
NiKon DTM-302 Replacement Battery 7.2V 3500mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
7.2V
Amp
3500mAh
NiKon DTM-302 / NPL-302 Series — 7.2V Ni-MH Replacement Battery (4/UR17650/3500)
This is a 7.2V, 3500mAh Ni-MH replacement battery for the NiKon DTM-302 and NPL-302 total station series, including the DTM-350 and NPL-350. It slots into the battery compartment on the instrument body and powers the angle encoder, EDM module, and display. Capacity matches the original pack at 3500mAh (25.2Wh).
- DTM-302 / NPL-302 / DTM-350 / NPL-350 compatibility: These instruments share the same battery bay geometry, 7.2V voltage rail, and contact arrangement. The BMS handshake on each model reads cell voltage directly — no proprietary authentication chip — so a correctly rated Ni-MH pack is accepted without firmware rejection.
- Bench tested on actual hardware: We cycled this pack through simulated EDM and angle-encoder load sequences. The BMS held stable under the initialisation current spike at power-up and did not trip during sustained measurement logging.
- Post-install calibration cycle: After fitting a new pack, run a full calibration sequence through the instrument menu before field deployment. The DTM-302 maps battery state during that cycle — skip it and the low-battery indicator will fire early on the first session, even with a fully charged pack.
BMS lockout after the DTM-302 sat unused in a carry case for months
Ni-MH cells self-discharge at roughly 1–2% per day at room temperature. A pack stored in a case over a long field off-season can drop below the BMS recovery threshold — typically around 5.4V for a 7.2V pack — and the protection circuit opens, blocking both charge and discharge. The charger shows no activity and the instrument does not power on. To recover, connect to the OEM charger (BC-60 or BC-65) and leave it for 20–30 minutes; most BMS circuits will accept a trickle pre-charge pulse that brings cells back above the recovery threshold before switching to full charge.
DTM-302 shuts down mid-measurement with no prior low-battery warning
This happens when cell voltage sags sharply under the combined draw of the EDM ranging pulse and the angle encoder — a load the instrument cannot sustain if any cells in the pack have developed high internal resistance from age or deep discharge. The BMS reads the sag as an under-voltage fault and cuts the circuit instantly, without triggering the low-battery display first. A fresh pack at full charge will hold voltage above the cutoff threshold through that combined load. If the new pack still shuts down, check that the battery contacts on the instrument are clean — oxidised contacts add resistance and can push the voltage reading below the BMS threshold even with a healthy pack.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: NiKon
- 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
The DTM-302 powers on fine but cuts out the moment I fire a distance measurement — why?
The EDM ranging pulse draws a sharp current spike that, combined with the angle encoder load, can pull cell voltage below the BMS cutoff threshold in under a second. This happens when cells have high internal resistance — either from age, previous deep discharge, or prolonged storage. A new pack at full charge handles that spike without the voltage sag that trips the cutoff. Before field use, run the post-install calibration cycle so the instrument correctly maps the new pack's voltage curve.
After the instrument sat in storage all winter, the charger shows no sign of life when I plug the battery in — is the pack dead?
Not necessarily. Ni-MH cells self-discharge over months and can fall below the BMS recovery voltage — around 5.4V for this 7.2V pack — which causes the protection circuit to open and block all charge input. Connect the pack to a BC-60 or BC-65 charger and leave it for 20–30 minutes without interruption; the charger delivers a trickle pre-charge pulse that nudges cells above the recovery threshold before switching to normal charge. If the charge indicator still shows nothing after 30 minutes, check the charger contacts and try a second port or unit before assuming the cells are unrecoverable.
My DTM-302 shows wildly inconsistent battery percentage readings after fitting the new pack — it jumps from 80% to 20% between boots. What's happening?
The DTM-302's voltage-threshold indicator is calibrated against the discharge curve of the old pack it last saw. A new pack with full cells has a slightly different resting voltage profile, so the instrument misreads state of charge until it has seen at least one complete discharge-to-recharge cycle. Run the instrument through a full measurement session until the low-battery warning appears, then charge fully — one complete cycle resets the threshold mapping. After that cycle, the percentage display will track accurately against the new pack's actual capacity.
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