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Rectangular lithium battery pack, dark finish, 70.8 by 38.4 by 20.6 millimetres

Estry

Estry GL820 standard battery 7.4V 3000mAh

SKU CH-CZH9-ZPA6P MPN GL820

Replacement lithium pack rated 7.4 V and 3000 mAh fits Graphtec GL820, GL200, GL840, GL900 and other listed models

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity3,000 mAh
  • Battery voltage rating7.4
  • Product typeBatteries
  • 3000mAh lithium cell powers Graphtec loggers longer
  • 4V nominal voltage matches original B-569 specifications exactly
  • Fits GL820, GL200, GL840, GL900 and twelve other models
  • Overcharge, over-discharge and short-circuit protection built in
  • Compact 70.8 x 38.4 x 20.6mm pack weighs 135.0g

Replacement battery for Graphtec data loggers

The Estry GL820 is a 7.4V 3000mAh lithium pack built to match the original specifications for Graphtec models including the 820, 200, 840, 200A, 900, 800E, 500A, 450, 240, 220E, 220, 820E, 800, 900E-8 and 900E-4. It replaces part numbers B-569 and XU101035-17001A and comes as a single unit certified to ISO9001, RoHS, CE, UN38.3 and MSDS standards. Overcharge, over-discharge, over-voltage and short-circuit protection circuits are integrated for safer operation.

Verify model and part number before ordering

Confirm that your device appears in the supported model list and that the original battery carries one of the listed part numbers. The pack measures 70.8 x 38.4 x 20.6mm and weighs 135.0g, so check that the compartment can accommodate those dimensions. No charger is included with this battery, so ensure you have a compatible charging method already available.

Thermal behaviour and power profile

Lithium chemistry keeps self-discharge low during storage and delivers steady voltage through the discharge cycle. The protection circuitry limits current spikes and prevents deep discharge, which helps maintain cell temperature within normal limits during typical logging sessions. Rated capacity is 3000mAh with a nominal energy content of 25.9Wh, and the 7.4V output matches the original equipment requirement without additional regulation.

How it compares

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

Price $29.99
Pricier than about 85% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameGraphtec
Product typeBatteries
Power
Battery typeLithium
Battery capacity3,000 mAh
Battery voltage rating7.4
In the box
Battery pack size1-pack

Questions about this item

What comes in the box and do I need to buy a charger separately?

The package contains one 7.4 V 3000 mAh lithium battery measuring 70.8 x 38.4 x 20.6 mm and weighing 135.0 g; a charger is not included.

Which capacity version should I choose for my Graphtec logger?

This listing is the single 3000 mAh version rated at 25.9 Wh; select it if your device uses part numbers B-569 or XU101035-17001A.

What does the 3000 mAh rating mean once the battery is installed in a GL820?

At 7.4 V the pack delivers 25.9 Wh, so runtime equals that energy divided by the logger’s actual current draw, which changes with sensor count and sample rate.

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