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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 42.92 Wh

SKU CH-G4GM-JKZPH

Two 7.4 V 5800 mAh lithium-ion batteries with an LCD USB 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
  • Two 5800 mAh Li-ion packs power long survey sessions
  • 92 Wh capacity matches original BT-65Q runtime
  • USB 5 V input charges from wall, car or laptop
  • LCD shows real-time status for each of three bays
  • Replaces Topcon BT-60Q, BT-61Q, BT-62Q, BT-65Q, BT-66Q and GMS-2

Compatible replacement kit

This kit provides two 7.4 V lithium-ion batteries rated at 5800 mAh and 42.92 Wh each, together with an LTD2 USB charger. It replaces Topcon BT-60Q, BT-61Q, BT-62Q, BT-65Q and BT-66Q cells and works with BC-30, BC-30D and BT-30 chargers.

Build integration

The charger accepts a 5 V 2 A USB supply and can charge two batteries simultaneously, removing the need for a dedicated AC adapter. A micro USB cable is included so the unit can run from a wall adapter, vehicle socket or computer port. The LCD shows charge status and remaining capacity for each cell.

Sustained operation

Each battery delivers 42.92 Wh at 7.4 V for extended field sessions with Topcon GTS, GPT and FC series total stations. The charger outputs 8.4 V at 0.5 A per channel, maintaining a steady charge rate during long workdays without requiring a high-wattage power source.

How it compares

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

Price $51.99
Pricier than about 90% of the 5,900 comparable items (median $17.99).

Specifications

Product
Brand nameKastar
Model nameBT-65Q
Part numberCH-LTD2-2B-BT65Q-C
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

Questions about this item

How long can the 42.92 Wh batteries run a Topcon GTS-900A total station before needing a recharge?

Runtime depends on the instrument's power draw; the 5800 mAh cells at 7.4 V store 42.92 Wh each.

Does the LTD2 charger become hot or noisy when charging two batteries continuously from a 5 V 2 A USB source?

The charger draws 10 W from USB and outputs 8.4 V at 0.5 A per slot, running silently with no fan.

Which USB power adapter must I already own to operate the charger at full speed?

Any 5 V 2 A (10 W) USB wall or car adapter with a Micro USB cable will deliver the rated 0.5 A per channel.

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