Magicshine - replacement battery PCB

[w01fy]

Hi all,

Got a magicshine battery pack that has been hit by the elements.

The cells seem okay, but the protection PCB is corroded to the next life and I am looking for a replacement.

I have trauled places like DX and only found one replacement so far on US site for less than 5 dollars, but then shipping to the UK takes the cost to almost 30 dollars and hardly worth it.

was hoping I would find on on DX due to the freeshipping and just wait for it to turn up, but then only have protection circuits for 3.7v, not 7.4v...

(Magicshine battery pack is 4 x 18650 cells, 2 in series , 2 in parrallel with a protection circuit)

Don't really want to buy another battery pack as the board is peanuts

Can anyone help at all?

Cheers

w01fy

 

[kwarwick]

Hi all,

Got a magicshine battery pack that has been hit by the elements.

The cells seem okay, but the protection PCB is corroded to the next life and I am looking for a replacement.

I have trauled places like DX and only found one replacement so far on US site for less than 5 dollars, but then shipping to the UK takes the cost to almost 30 dollars and hardly worth it.

was hoping I would find on on DX due to the freeshipping and just wait for it to turn up, but then only have protection circuits for 3.7v, not 7.4v...

(Magicshine battery pack is 4 x 18650 cells, 2 in series , 2 in parrallel with a protection circuit)

Don't really want to buy another battery pack as the board is peanuts

Can anyone help at all?

Cheers

w01fy

http://www.all-battery.com/pcbfor74vli-ion1865032056.aspx

http://www.all-battery.com/pcbfor74vli-ion186501850072vbatterypacks35alimit-pcb74v32004.aspx

 

[w01fy]

cheers for the link, unfortunetly I'm in the UK and they want 60 dollars to ship 🙁

Would both of those be okay for a 4 cell battery pack? One mentions its for use with 2 cell (presuming putting some in parrallel to affectively make only 2 cells means this is fine)

Cheers

w01fy

 

[kwarwick]

cheers for the link, unfortunetly I'm in the UK and they want 60 dollars to ship 🙁

Would both of those be okay for a 4 cell battery pack? One mentions its for use with 2 cell (presuming putting some in parrallel to affectively make only 2 cells means this is fine)

Cheers

w01fy

OK, how about this one from HK... looks similar to the existing board in the MS pack:

http://cgi.ebay.com/Protection-Circ...136?pt=LH_DefaultDomain_0&hash=item335f518d08

You're correct that wiring the cells in parallel make the pack just a higher capacity 2 cell pack.

 

[darkmilk]

Same here! Corroded PCB, cells seem OK.

I found that one on ebay linked above too, it looks extremely similar but the component layout is slightly different.

Anyone know if the original board, or this one, do balancing? I would guess no and no. I can't seem to find any 2s2p specific balancing boards anywhere...


Only one way to find out if it works I guess. I'll order one but might be a while.

The new battery packs on the new version just released on DX look much better though, if only they were available separately. (they look like a plastic case, with a voltage meter inbuilt)

 

[kwarwick]

Well both the original and the eBay board *could* balance the charge since they both have the necessary center tap connection between the two batteries (marked BM on the eBay board). But without knowing more about the actual electronics on these boards I couldn't say...

 

[BrianMc]

FWIW my understanding is that balancing is not that important with 2s packs, a good idea with 3s, and 4s and higher it becomes important to essential. The 3S PCM board with balancing I purchased had a diagram for wiring the two taps allowing the balancing function. I'd hope the 2S board would have the same.

 

[irri tant]

Got a magicshine battery pack that has been hit by the elements.

The cells seem okay, but the protection PCB is corroded to the next life and I am looking for a replacement.

mine also

FWIW my understanding is that balancing is not that important with 2s packs,

I race radio control cars which use 2s lipo and we balance charge 99% of the time.

 

[irri tant]

OK, how about this one from HK... looks similar to the existing board in the MS pack:

http://cgi.ebay.com/Protection-Circ...136?pt=LH_DefaultDomain_0&hash=item335f518d08

might have to get one of those :twothumbs

here they are together, ebay on the left, origanal on the right
http://img4013.photobox.co.uk/16003...d59e5db179dcb90efe7c963e75b3dbe6633da2684.jpg

 

[trout]

You could try Here www.mtbbatteries.co.uk
I know he builds MS replacement batteries and may be able to help .

 

[darkmilk]

Well, partial success:

got the one ordered from ebay as above. But: it only has one of the two chips shown in the photo.

The pack charges OK, to a cutoff of somewhere between 8 and 8.4V (dodgy multimeter). Short circuit protection works, even though I didn't actually mean to test that, oops!

The light head powers up, but only at reduced power and with an inductor whine and red light like a very low battery.

So my guess is that the single chip is reducing the current handling from the claimed 5A to 2.5A or less, about what the light should draw.

Have contacted the seller, will see if the double chip version is available.

 

[irri tant]

got the one ordered from ebay as above. But: it only has one of the two chips shown in the photo.

post a picture of the one they sent

hope mine comes through as the ones pictured on ebay

 

[irri tant]

Well, partial success:

got the one ordered from ebay as above. But: it only has one of the two chips shown in the photo.



Have contacted the seller, will see if the double chip version is available.

mine have arrived and they only have one chip, u3 is missing :thumbsdow

http://img3011.photobox.co.uk/38314...a53299db09ef8691b9115c6813b7279ca78179bf5.jpg

did you get a reply from the seller?

 

[darkmilk]

Here's a photo of the board I received, in it's current state:



Note the blown up chip ... so it is obviously not short circuit protected. Either me possibly mometarily shorting it with a multimeter probe, or the current draw from the light head, was too much for it. So much for being a protection circuit.

So the chip missing is the same as yours irri tant, U3. Are you able to read the numbers on the chip? I can't see mine any more 🙁

The seller has offered a refund if I send a photo. (Assuming this is because it's different to the photo in the listing)

 

[irri tant]

So the chip missing is the same as yours irri tant, U3. Are you able to read the numbers on the chip? I can't see mine any more 🙁

Yes

original

ebay

 

[darkmilk]

The seller gave me a refund... which is kinda nice, but I still don't have a working battery pack!

I'd be interested to hear of anyone else's experiences, but I think I'll just order a new pack from DX. The protection boards available in the US might be worth a shot if you're there, but for the postage costs alone I can order several new packs. (and then I"ll have some spare 18650's, and you know what that means, I'll need more torches to use them in :devil: )

 

[irri tant]

The seller gave me a refund...

same here and has promised to send out the correct ones to boot 🙂

 

[fma_battery]

the 2S2P PCM with one chip is past already, all PCM now has two chips.

 

[Be-Seen Triker]

Thank you FMA Battery. This is a very nice product for DIY pack builders.

Am I correct in assuming that the charge circuit is a 4P configuration?

And please, what is the maximum charge rate?

 

[Microa]

It is still 2S2P configuration. The chip they are talking about is a dual MOSFET. Now, they use 2 chips in parallel to increase the current handling capacity.