Introduction: How to Change the Lead-acid Cell in an Original Bowens Travelpak

This really is a piece of cake!

Tools required: Philips-head screwdriver, common sense.
Materials required: 12V 7AH (12 volt, 7 amp-hour) sealed lead-acid cell. Widely available from around £15, such as the Yuasa NP7-12.

The hardest part is removing the battery pack from the fabric holder. It is fixed tightly with velcro, but once you've got part this, it just slides out.

Step 1:

Lift the battery out of the plastic bucket it sits in.

You then need to remove 12 screws - five on either side and two on the bottom.

Step 2:

Slide the bottom section off, and you can now see the cell and electronics.
Remove the leads from the battery - they'll just slide off.

Step 3:

Take the protective plastic covers off the terminals of your new battery.

Step 4:

Attach the new battery, making sure to attach the red lead to the positive terminal and black to the negative.

Step 5:

Finally, put it all back together, making sure all 12 screws are just tight.
Give it a charge, and off you go!

This is not endorsed by Bowens or Yuasa and I take no responsibility for you electrocuting yourself!

All the copyright of all photographs in this instructable are the property of the creator, and must not be used without permission. 

Comments

author
ChrisYarrow (author)2017-07-18

Thank you!

The cells in my Bowens Travelpaks are well and truly dead, and I found out the hard way right in the middle of a shoot!

Questions:

1) Is the 7AH important? Can it be more or less? Does that just relate to how long the battery will last?

2) Could Lithium batteries be used in place of Lead Acid (with the appropriate charger, of course)

author
theos75 (author)ChrisYarrow2017-07-20

Hi Chris,

Yes, 7AH refers to the batteries capacity. You could put a larger capacity cell in if it fits. I don't think you'd be able to get a lead acid cell the same size with a higher capacity, but don't let me stop you trying!!

With regards to using a lithium cell in it's place, to be honest, I don't know. I don't know if they could supply the same current as lead acid... I'm not sure it would make the recycling times any quicker, but it would be a lot lighter!

author
ChrisYarrow (author)theos752017-07-24

Perfect!

So I've been thinking, I'm going to add a larger capacity battery to my TravelPak and modify my housing to fit. The Bowens price for the larger capacity battery is £160, but the battery alone is about £30. That's one hell of a saving.

I'll be sure to thank you for your guide. Without you I doubt I would've had the confidence to tinker with my own kit!

author
theos75 (author)ChrisYarrow2017-07-25

Good luck with the mod. Remember to measure twice, cut once, not what I often do - measure once, cut twice!

Glad to have saved you some cash :-)

author
MilanS31 made it! (author)2016-02-17

Hi, just replaced mine battery and it works perfectly with £15 battery, saving me a small fortune ;-)

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Bio: I am a freelance photographer, and dislike being charged extortionate amounts for for bits of wire!
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