PCB for Battery Pack

[Codiak]

reading instructions is always a good starting point.

Understanding the reasons why is even better.

The pack you have above doesn't have a balance connector wired.

 

[trimixdiver]

I know this I build the battery pack, what I was thinking is to add a wirefor this?

 

[Codiak]

I'm a fan of balancing packs and there are two ways for you to go.
1) wire a standard connector like a JST
or
2) use a balancing PCM

Either is effective I prefer the latter.

 

[trimixdiver]

I already have a PCB on the pack ,so where can I connect wire to?
Tony

 

[Codiak]

I don't think you PCB has a balancing function so you need to get a balancing connector and wire according to specs

good reference
https://sites.google.com/site/tjinguytech/charging-how-tos/balance-connectors/

basically, the connector will have 1 wire more then the number of cells in the pack and you solder one wire to each batter contact point.

Google a bit if you need a diagram

 

[trimixdiver]

Do I really need this wire I mean what's the worse that could happen , kill the battery pack?
Tony

 

[Codiak]

Do I really need this wire I mean what's the worse that could happen , kill the battery pack?
Tony

Balancing simply ensures that all the cells of the pack are equally charged.
No it's not required and no the lack of it will not kill the pack. It may shorten the life of the pack, but it's not life threatening.

Just "charge" you pack with the + and - leads and don't worry about balancing.

 

[trimixdiver]

Cool thanks for the heads up.

 

[trimixdiver]

Hi guys just doing a burn test using this pack , what is the procedure for burn time, do I just keep going to the light goes out...or turn of when the battery reaches a certin AMP ?
I'm thinking the PCB will cut the light of...
Don't want to damage the pack...
Tony

 

[350xfire]

Make sure you do it while the light in is a bucket of water. Turn light on and wit until it dims.

 

[trimixdiver]

Hi Hector was waiting for you to turn up...
Yes I have it in a bucket, Ok I started at 500pm and its still going strong .

Started with 7.9vlt
10min - 7.9
30min - 7.8
1hr -7.8
2hr-7.7
3hr-7.64
4hs-7.59
5hs-7.38
6hr-7.34

And it's still going is this wright hector, shouldn't the PCB kick in and turn battery of ?

Tony

 

[350xfire]

Could be, although I would expect with 2500mah cells to be more like 4-5 hours. Cycle the switch on and off and make sure it's on the high mode. That is a 5 mode light. Three brightness and 2 strobes.

 

[trimixdiver]

Didn't know that this head had 5 modes,:twothumbs cus I just have a on/of toggle , but turning on/of I just noticed that it can be changed...
Pretty sure it's on the brightest mode , went to bed after 7 .10 min hrs burn time , continue the burn time today.
Tony

 

[trimixdiver]

Today I started to finish the battery Pack burn time I end the discharge at 8hrs 30 min...
I am surprised at the length of Burn time, won't need to charge to often .

 

[350xfire]

WOW! that's a great run time.

 

[trimixdiver]

Hector would this be wright, wasn't expecting that!

 

[350xfire]

Hector would this be wright, wasn't expecting that!

I was expecting 5-6 at full brightness but may be after that the light is just dimming out

 

[trimixdiver]

No mate I had it on the brightest setting , just need to take for a dive tomorrow .
How do you clip on a bolt snap Hector, was going to attach to the gland with zip tie?
maybe not use my good man handle looks a bit bulky with my Meg?

Some pic's...

Tony

 

[350xfire]

Tony, you would need to clip the snap to the handle. I am not sure I would clip it where you have it as it could cause some strain on the cable. Good luck with it tomorrow, looks good!