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Two rectangular lithium-ion batteries and a compact USB charger with LCD screen

Kastar

Kastar BT-65Q 2-pack battery and LTD2 USB charger

SKU CH-PRJQ-2RWYB

Two 7.4 V 5800 mAh lithium-ion batteries and a USB LCD charger that powers up to three cells from any 5 V source

  • Total capacity42.92 Wh
  • Pack contents1 Charger + 2 Batteries
  • Battery chemistryLi-Ion
  • Product typeBattery & Charger
  • Product dimensions3 × 2 × 2 in
  • Key featuresLCD USB Dual charger, can charge 2 batteries at the same tim

Configuration 1 Charger + 2 Batteries

  • Replaces Topcon BT-60Q, BT-61Q, BT-62Q, BT-65Q, BT-66Q and GMS-2 batteries
  • Powers Topcon FC-200, FC-2200, FC-2500, GPT-7000i, GTS-750, GTS-751, GPT-7500, GTS-900, GPT-9000 and ROBOTIC total stations
  • LCD USB charger accepts 5V 2A input and delivers 8.4V output for up to three batteries
  • Intelligent LCD shows real-time charging status and remaining capacity
  • Supplied with Micro USB cable for wall, car or computer power

Kastar BT-65Q Li-Ion replacement pack

This pack contains two 7.4 V lithium-ion batteries rated at 5800 mAh and 42.92 Wh each, plus a dual-slot USB charger. It replaces Topcon BT-60Q, BT-61Q, BT-62Q, BT-65Q and BT-66Q cells used in GMS-2 and robotic total stations.

Thermals, noise and power draw

The charger accepts a 5 V 2 A USB supply and delivers 8.4 V at 0.5 A per bay, totalling 10 W input. An intelligent LCD shows real-time charging status and remaining capacity for each cell. No active cooling is required, so operation is silent.

Build integration

The compact charger measures 3 by 2 by 2 inches and runs from any USB wall adapter, car charger or computer port via the included Micro-USB cable. It frees you from proprietary AC docks and lets you top up two batteries simultaneously in the field. Not suited for instruments requiring the original BC-30 or BT-30 charging protocol.

How it compares

Measured against everything we stock in Camera Batteries, Grips & Chargers, at today’s prices. Recalculated every night.

Price $50.99
Pricier than about 89% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameBT-65Q
Part numberCH-LTD2-2B-BT65Q-A
Total capacity42.92 Wh
Product typeBattery & Charger
Power
Battery chemistryLi-Ion
Size & build
Product dimensions3 × 2 × 2 in
In the box
Pack contents1 Charger + 2 Batteries

Other versions of this model

1 more in the same range

Questions about this item

How do I install the Kastar BT-65Q batteries into the LTD2 charger and which step do people miss?

Insert each 7.4V 5800mAh battery into one of the three slots until it clicks; the step users miss is confirming the LCD shows a charging icon for every bay before walking away.

What maintenance or replacement will the Kastar BT-65Q pack need over time?

The two Li-Ion cells will gradually lose capacity; plan to replace both when run-time drops below what your Topcon FC-200, FC-2200 or GTS-750 survey instrument requires for a full field day.

What limit appears first during sustained charging of the Kastar BT-65Q batteries?

The LTD2 charger delivers 8.4V 0.5A per slot from a 5V 2A 10W USB input, so the 0.5A per-bay current ceiling is the bottleneck that lengthens charge cycles when all three positions are occupied.

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