[PSUBS-MAILIST] Magnacom SW-1000-sc Battery

Fri Dec 18 19:46:19 EST 2020

I have made packs before using Saft cells (which IMO are some of the best out there), but the nominal cell voltages of lithium technology cells do not match standard alkalines, so you have to choose your cell type and number of cells in series so that the pack overall comes out the same.

Sean

-------- Original Message --------
On Dec. 18, 2020, 16:52, Alan James via Personal_Submersibles wrote:

> David,
> I have been making up packs of lithium iron batteries and they don't require any electronics other than the external balance charger. You just need to solder on balancing charge leads between the +&- on each battery & the appropriate connector. There are a few different sizes & types of lithium iron batteries. You may find a square type of rc hobby lithium battery of the correct size & voltage off the shelf. Can help a bit more if you aren't familiar with rc lithium iron batteries.
> Alan
>
> On Saturday, December 19, 2020, 09:24:43 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Hi Alan, The unit in the sub I can. The topside unit I was hoping to keep the unit intact in case it could also be used as a diver unit.
>
> Best Regards,
> David Colombo
>
> 804 College Ave
> Santa Rosa, CA. 95404
> (707) 536-1424
> www.SeaQuestor.com
>
> On Fri, Dec 18, 2020 at 12:03 PM Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>> David,
>> can you just wire them in to 12V in the boat & forget about the battery packs, or are you intending to use them for scuba diving.
>> Alan
>>
>> On Thursday, December 17, 2020, 06:39:22 AM GMT+13, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> Hi guys, I torn down the one battery I got with my magnacom units so I can build a couple more. Attached are photos of the teardown. Only problem is one component that only had labeling on one side. The other side had only the letters va with a smudge over other data. I think it's a fuse based on the fact it interrupts the circuit. I sketched out the circuit for reference. I thought taught there might be a BMS, but apparently not. Jon, to recreate the circuit board component, would you recommend having done by a fabricator? Any ideas or thoughts would be appreciated.
>> Thanks,
>> David
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