Making a battery pack for Canon camcorder


Status
Not open for further replies.

sloth

New Member
OK, here's where my whacky idea begins.. :)

The stock BP809 lithium pack on my Canon HF100 is way too small for nailed-to-the-tripod shooting, let's say for a long speech or event that I just want to keep recording. I could simply buy the longest extension cord I can get my hands on, but where is the challenge in that?

(and sometimes I shoot on location, so cord no enough.. sure one :D)

The pack is 8.4V, 900mAH. The camcorder draws something like 600mA (estimated) when recording, which yields an hour and a half. The camcorder also has a 8.4V DC input, which is used to power it, charge it, and keep it running let's say in a studio. The camera can run indefinitely off that input since it comes from an AC adapter.

I am thinking of buying a 3mm barrel connector and putting together a battery pack, say a 2000mAH AA cell pack or 3600mAH Sub-C. I'd need 6xNiMH and I already have the pack charger (Hyperion 6060i. No I'm not from the RC guys.. try to think of another hobby that involves battery packs :D).

"Hot" off the charger NiMH would be 6 x 1.4V, which is 8.4V. Nominal is 7.2V, just a bit less than the 7.4V nominal of Li-ion.

That would give me something like 3-6 hours of full blast recording time. And cost much less than the original pack. Safe too, unlike the chiong packs. I would lose my battery gauge, the camera would think it is on "AC" but I can always rely on the onboard battery should I run out. And with six hours of shooting time I think I would have long given up and gone home already.

What do you think?
 

Sounds like a plan!

I have the same HF100 and the stock batteries does not last very long. I was also thinking of a sort of battery pack since the BP819 costs quite a bit. If you succeed, please post some pics! :)
 

Hi,

In my opinion, custom packs are usually not worth the trouble because connectors are not reliable.

More too often that I experience intermittent power loss due to the connections.
If you need to use handheld and move around a lot, external batt packs just don't work for me. If static shots mounted on tripods and you know that no one is going to disturb it, then it's quite all right, but if it's static, I'd rather stick to running an AC cable. Those DC jacks are just painful and unreliable.

I run small cameras as my static cam to capture 'safety' wide angle shot and have configured too many batt packs on my own....from regulated NiMH to Lithium Polymers to Sealed Acid packs...none of them worked well for me on consumer cameras, but I have successfully configured external packs with cameras that uses a dummy battery as connectors....those are a lot more reliable..

After looking back at it, I find that customising batt packs tend to waste your time, more messy cables, then you need to worry about maintaining your external packs, etc...Sometimes it's just easier to grab OEMs or original batts.


2 cents of my experience with customised batt packs. :thumbsup:
 

If voltage is right for your camera, you can consider using this pack:

EDV002SK.JPG

EDV002SK.jpg


I'm using this as my external pack for my AVCHD cameras and my eeePC. :)
It comes in NiMH config or Li-Ion config, 12vdc input with internal charging circuitry, and regulated 9vdc output, 4200mah for the Li-Ion model.
 

Last edited:
that pack will make it 9.6v average and may go up to over 10v when fully charged.
Unless it is regulated, it may be not work on certain cameras.

Perhaps Canon HF-100 is better in terms of DC voltage input.

My Panasonic HSC-1U (aka. SD1) takes in 8.4v, but the circuitry voltage tolerance level is very narrow. anything more than 9.6v or less than 8v, the camera shuts down by itself.
:confused:
 

that pack will make it 9.6v average and may go up to over 10v when fully charged.
Unless it is regulated, it may be not work on certain cameras.

Perhaps Canon HF-100 is better in terms of DC voltage input.

My Panasonic HSC-1U (aka. SD1) takes in 8.4v, but the circuitry voltage tolerance level is very narrow. anything more than 9.6v or less than 8v, the camera shuts down by itself.
:confused:


Please note that I said to connect 4 cell in one holder in series with 2 in the other. 6 cells total. I get about 7.9 volts.
 

Please note that I said to connect 4 cell in one holder in series with 2 in the other. 6 cells total. I get about 7.9 volts.

Thanks for confirming that it works. I can get 3 battery holders at a local store.

The problem with such a design is that you lose the ability to monitor battery status, and you trade $$ for some inconvenience (have to remove batteries to charge, for example). Losing the ability to monitor batteries is the most worrying part for me - with a properly designed battery circuit, an IC will monitor the battery voltage, and stop drawing power if voltage falls too low. It is unclear how the HF-100's DC input will behave.

Ideally the battery pack will take 8 cells, regulate it to 8.4V DC, and shut down if voltage falls too low. But I have no experience designing such a circuit, maybe some EEs can help. Here's an example :

http://www.maxim-ic.com/appnotes.cfm/an_pk/423
 

Hi all,

Appreciate the time and thought you have put into the replies for this thread. I find it very very helpful. Agreed there are tradeoffs and I will accept that. $$ being no object I would buy the original but I wanted to tinker a little. Haven't used the soldering iron for too long ;)

Bill, extra special thanks for making one and confirming that it works and won't fry the camera! I had a similar design in mind except that I might simply go for one big pack of cells resistance-welded together.
 

Bill, extra special thanks for making one and confirming that it works and won't fry the camera! I had a similar design in mind except that I might simply go for one big pack of cells resistance-welded together.

Wouldn't it be better to have them in a battery holder so that they can be recharged individually? If you weld them together, how are you going to recharge them? Custom charger?
 

Wouldn't it be better to have them in a battery holder so that they can be recharged individually? If you weld them together, how are you going to recharge them? Custom charger?

Pack charger. I have a Hyperion 0606i is configurable to charge just about anything I have a use for :)

http://media.hyperion.hk/dn/eos/

Accomodates NiMH packs with up to 14 cells..

I bought the charger for other projects, so it is essentially a sunk cost. For users who do not have access to these pack chargers it is probably easier to work with holders.

I find that cheap holders have resistance issues - they become uncomfortably hot at currents above 1 amp, so I would prefer a welded connection.
 

Last edited:

No experience - in fact, until fairly recently, I haven't found many 3rd party batteries. And my favorite battery online sellers still don't have compatible ones yet. The one you listed is US$60 though, the original is less than US$120. Not enough of a savings for me to go with an unproven brand.

Thanks for the very detailed description on what happens when voltage is low. How did you test that? With a variable voltage power supply or just by observation as your pack is depleted? Do you have the BP809 battery connected when testing? Thanks.

Pack charger. I have a Hyperion 0606i is configurable to charge just about anything I have a use for :)

Wah, chim... thanks for the info :)
 

I monitored the output voltage from the battery pack. The BP809 battery was removed.
 

Hey! Thanks for the pictures. I assume you gotta charge the batteries outside of the holders? It looks quite easy to make. 3 hours is a good time. Do you use the battery pack with the original batteries plugged in?

Thanks!:)

Yes on charging the batteries
Yes I remove the camera battery when using the battery pack.
 

Managed to get my pack built. Using 3300mAH Sub-C NiMH. Managed to get around 2 hours of recording time from it on my first trial run. Pack charger indicates that it charges back up to full 3300mAH capacity though, maybe my pack needs more conditioning.

Didn't see the red blink though - my camcorder immediately shut down..
 

Managed to get my pack built. Using 3300mAH Sub-C NiMH. Managed to get around 2 hours of recording time from it on my first trial run. Pack charger indicates that it charges back up to full 3300mAH capacity though, maybe my pack needs more conditioning.

Didn't see the red blink though - my camcorder immediately shut down..

How many cells did you use?
 

Managed to get my pack built. Using 3300mAH Sub-C NiMH. Managed to get around 2 hours of recording time from it on my first trial run. Pack charger indicates that it charges back up to full 3300mAH capacity though, maybe my pack needs more conditioning.

Didn't see the red blink though - my camcorder immediately shut down..

Did you remove the camera battery?
 

Status
Not open for further replies.
Back
Top