Kastar 4-Pack Ei-D-Li1 Battery and LTD2 USB Charger - Spare Power Pack

In this review the Kastar 4-Pack Ei-D-Li1 Battery and LTD2 USB Charger is evaluated as a practical spare power solution for field GNSS and camera users who need multiple batteries and a flexible, portable charger. The bottom line: this kit is best for professionals and hobbyists who need to carry extra 7.4V lithium-ion cells and charge two at once from a USB power source. The reviewer found the combo useful for extended workdays because of the 2600mAh capacity per cell and the dual USB charging options, though some users reported variability in individual cell quality.

Key Features

• Battery Capacity: Each battery is 2600mAh, providing extended runtime for compatible Trimble and Pentax devices compared with smaller replacements.
• Battery Type: The pack uses 7.4V Lithium-Ion chemistry, which balances energy density and weight for field use.
• Dual Charging: The LTD2 USB charger can charge two batteries at the same time, which reduces downtime when multiple spares are in rotation.
• Swappable Plate: The charger plate can be changed to fit different battery contacts, adding compatibility flexibility for varied equipment.
• Multiple Inputs: Charger accepts Micro-USB and Type-C input and includes a Micro-USB cable, so it works from common 5V 2-3A USB power banks and adapters.
• LED Status: Intelligent LED indicators show charging status and approximate battery capacity so users can monitor charge progress at a glance.

Who It's For

This kit is aimed at surveyors, GNSS technicians, and photographers who use compatible Trimble, Pentax or HP devices and need several spare 7.4V batteries on hand. The 4-pack is convenient for multi-day field assignments or for teams that share equipment and want a single, portable charging solution.

It is less appropriate for users who require brand-new OEM cells guaranteed by the original manufacturer or for those who need higher current fast-charging beyond the charger's 800mA per slot output. Prospective buyers should also consider that some customers reported mixed batch quality, so inspecting each cell on arrival is wise.

Pros & Cons

Pros

• Provides four spare 7.4V 2600mAh batteries to extend field runtime without searching for outlets.
• Dual-bay LTD2 charger can top two batteries simultaneously, shortening reload cycles.
• Multiple input options and included Micro-USB cable mean easy use with common power banks.

Cons

• Customer feedback shows mixed battery quality; one reported only one of four cells worked reliably.
• Charger output is limited to 800mA per bay, so charging is not fast compared with higher-current chargers.

Specifications

Battery Type	Lithium-Ion
Battery Voltage	7.4V
Battery Capacity	2600mAh (each)
Charger Input	5V 2-3A (15W)
Charger Output	8.4V 800mA x1 or 800mA x2
Inputs Supported	Micro-USB and Type-C (Micro-USB cable included)

Our Verdict

The Kastar 4-Pack Ei-D-Li1 with LTD2 USB charger is a cost-effective, portable power solution for users who need multiple spare 7.4V batteries and convenient USB charging. It is good value for teams and field operators who prioritize capacity and flexibility, though buyers should inspect delivered cells because customer reports indicate occasional variability in individual battery performance.

Frequently Asked Questions

Are these batteries compatible with Trimble R8 series?
Yes, the pack lists compatibility with Trimble R4, R6, R7, R8, R8 GPS and R8 GNSS models on the compatibility list.

Can the charger run from a standard power bank?
Yes, the charger accepts 5V 2-3A input and will operate from most USB power banks; use a power bank rated to supply the needed current for two bays.

Does the kit include a Type-C cable?
The kit includes a Micro-USB cable and the charger accepts both Micro-USB and Type-C input, but a Type-C cable may need to be provided separately if required.