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Watson DMW-BLJ31 Lithium-Ion Battery Pack (7.4V, 3500mAh, 25.9Wh)

BH #WADMWBLJ31 • MFR #B-3649
15 reviews
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Watson DMW-BLJ31 Lithium-Ion Battery Pack (7.4V, 3500mAh, 25.9Wh)
Key Features
  • For Panasonic DC-S1, DC-S1R & DC-S1H
  • Lithium-Ion Chemistry
  • Capacity of 3500mAh
  • Output Power of 7.4V, 25.9Wh
The Watson DMW-BLJ31 Lithium-Ion Battery Pack is compatible with Panasonic DC-S1 and DC-S1H mirrorless cameras. The battery has a capacity of 3500mAh and an output voltage of 7.4V. It also provides 25.9Wh for longer periods of shooting time.
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Watson DMW-BLJ31 Overview

The Watson DMW-BLJ31 Lithium-Ion Battery Pack is compatible with Panasonic DC-S1 and DC-S1H mirrorless cameras. The battery has a capacity of 3500mAh and an output voltage of 7.4V. It also provides 25.9Wh for longer periods of shooting time.

Compatible Cameras
Panasonic: DC-S1, DC-S1H, and DC-S1R mirrorless cameras
Replacement Battery
The Watson DMW-BLJ31 is a replacement battery
Capacity
The battery has a capacity of 3500mAh
Watt Hours
The battery provides 25.9Wh for longer periods of shooting time
UPC: 847628025455

Watson DMW-BLJ31 Specs

Battery
Battery Type
1x Panasonic DMW-BLJ31
Battery Capacity
3500 mAh / 25.9 Wh
Output Voltage
7.4 VDC
Battery Chemistry
Lithium-Ion
Accessory Mounting Thread
No
Dimensions
2.8 x 1.6 x 0.8" / 7.11 x 4.06 x 2.03 cm
Weight
3.85 oz / 109 g
Packaging Info
Package Weight
0.29 lb
Box Dimensions (LxWxH)
6.3 x 3.1 x 1.1"

Watson DMW-BLJ31 Reviews

Good replacement for the S1H

By Thomas
Rated 5 out of 5
Date: 2025-04-21

Other reviews in the past have mentioned swelling of these batteries but that could happen with any L-ion battery if you charge just for the sake of topping them off and/or without letting them cool down after use first.

Seems comparable to the first party ones

By Robert
Rated 5 out of 5
Date: 2024-03-20

Working well, no complaints

See any errors on this page?

Is the tight fit a potential issue once the ...

Is the tight fit a potential issue once the battery warms up with normal use? I'm concerned about the battery getting stuck inside the camera.
Asked by: David
A battery will swell when extremely hot--you should not allow the battery to be that hot in any case. When operating in a hot environment, you should check the battery and give it time to cool down, if necessary.
Answered by: Boyd H
Date published: 2021-06-14

Is there a Watson charging plate for this ...

Is there a Watson charging plate for this battery? I see there's an answer recommending a plate but it appears to be for the wrong battery, a battery ending in 13 not 31.
Asked by: Steven
No, I'm sorry, there's no Watson charging plate as of May 2021.
Answered by: Yoni S
Date published: 2021-05-24

I just purchased this battery for my S1 camera ...

I just purchased this battery for my S1 camera body. After fully charging the battery, I insert it into the camera and the camera will not turn on. Anyone else experiencing this issue, and any recommendations for what the problem/solution might be? Thanks much!
Asked by: Chris
Could possible be you received a bad apple which happens for time to time when things are made off an assembly line. Please contact our customer service department so that we can make things right.
Answered by: hectorm
Date published: 2022-05-01

Is there a Watson plate for this or is it too ...

Is there a Watson plate for this or is it too large a battery for it and an excepting plate to fit current chargers?
Asked by: FRED
The Watson Battery Adapter Plate for DMW-BCJ13: https://bhpho.to/3dqTjRK, is available.
Answered by: Leonard E
Date published: 2021-04-14

Does B&H sell a dual battery pouch that will fit ...

Does B&H sell a dual battery pouch that will fit two DMW-BLJ31 batteries? Ruggard battery pouch (B&H # RUBPR2SLRB) is too small
Asked by: Sean
The size of the Watson DMW-BLJ31 Lithium-Ion Battery Pack (7.4V, 3500mAh, 25.9Wh) poses a problem for our dual-battery pouches such as the Ruggard Battery Pouch for 2 DSLR Batteries (Black), B&H # RUBPR2SLRB. I think the best option would be a larger belt pouch such as the ARRI Camera Assistant Belt Pouch (Large), B&H # ARK20013016.
Answered by: Michael S
Date published: 2024-08-06

Can this Watson battery be charged using the OEM ...

Can this Watson battery be charged using the OEM charger?
Asked by: Ian
Yes it can.
Answered by: Luis L
Date published: 2020-12-10
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