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Author Topic: Making my own battery pack  (Read 4290 times)

me3

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Making my own battery pack
« on: July 10, 2014, 10:49:30 am »
Hi all, again  :-)

I need a small battery pack to run my small model from. The batteries it came with are only 1750mAh. I would like to have a few more to get better run times. Could I connect 6 NiMH AA Batteries together? This would give me 7.2V (or thereabouts) and say I got the most 'basic' at 600mAh each that would give me 3600mAh. Am I being mad or could this work? Would they still charge normally off a model charger or cant you do that?
Thanks,
Reece
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Calimero

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Re: Making my own battery pack
« Reply #1 on: July 10, 2014, 10:55:29 am »
Yes it would work.

You could also get a 2S LiPo but that would require a LiPo-aware charger (40$).
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Netleyned

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Re: Making my own battery pack
« Reply #2 on: July 10, 2014, 11:01:06 am »
6x600 in series will give you 7.2V @ 600mA not 3600mA


Ned
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Calimero

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Re: Making my own battery pack
« Reply #3 on: July 10, 2014, 11:07:32 am »
Indeed.


600mah AA size is pretty weak though. They hover around 2500mah these days. Note quite 3600mah though.
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inertia

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Re: Making my own battery pack
« Reply #4 on: July 10, 2014, 11:08:42 am »
Joining NiMH batteries into a pack isn't an easy job to do properly without a spot-welding machine. Not enough heat and the solder won't melt, but too much and you will fatally damage the cell. Why not buy a pack ready-made? These folk do hundreds of different types - I've picked out one which would suit you http://www.componentshop.co.uk/7-2v-aa-2600mah-flat-6x1-battery.html  There are others - have a browse.
DM
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me3

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Re: Making my own battery pack
« Reply #5 on: July 10, 2014, 11:12:03 am »
Okay then thanks, Forgot about how amperage works! haha, only a few weeks ago I took the As-Physics exam  :embarrassed: . That makes it a lot easier Inertia, I was hoping there would be a company that makes lots of sizes

Thank you,
Reece
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dreadnought72

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Re: Making my own battery pack
« Reply #6 on: July 10, 2014, 11:51:32 am »
To avoid soldering rechargeable AAs, you could pick up one of these. (6 AA battery holder). £1.59 from Maplins.

Andy
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Netleyned

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Re: Making my own battery pack
« Reply #7 on: July 10, 2014, 01:45:37 pm »
Quote from: dreadnought72 on July 10, 2014, 11:51:32 am
To avoid soldering rechargeable AAs, you could pick up one of these. (6 AA battery holder). £1.59 from Maplins.

Andy

These are no no for waterborne activities as they
quickly corrode and cause intermittent power transfer.

Ned
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grendel

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Re: Making my own battery pack
« Reply #8 on: July 11, 2014, 01:05:41 pm »
also if you get a short, the springs melt into the plastic and disconnect.
Grendel
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dreadnought72

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Re: Making my own battery pack
« Reply #9 on: July 11, 2014, 01:56:41 pm »
Isn't that a safety feature?  %)

Andy
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inertia

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Re: Making my own battery pack
« Reply #10 on: July 11, 2014, 02:05:57 pm »
Quote from: dreadnought72 on July 11, 2014, 01:56:41 pm
Isn't that a safety feature?  %)

Andy
Andy
I hope that the smiley face indicates tongue-in-cheek. There are some folk daft enough to think that's a good idea.
DM
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Netleyned

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Re: Making my own battery pack
« Reply #11 on: July 11, 2014, 05:27:42 pm »
And fuses are a lot cheaper than a meltdown :}

Ned
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