Any Electronics bods know what this is?

[maddog7]

Hi all,

I wonder if any of you that are electronics orientated might know what this does:
I pulled it out of a hope MTB battery. Liion 7.2v 2s2p 5200mah. which stopped charging.
It's looks to me like it could actually be some kind of combined balancer/charger or just a balancer.
The reason I think this is that the charger that plugs into the wall only has a single plug (2 pole) which connects to the battery.

I've wired the battery lead directly to the terminals of the battery and it's merrily charging away on my Hyperion eos charger.

My concern is that I'm wrong about the purpose of this device and that if I connect it to my light without this bit that it'll blow up my expensive bike light!
I suppose every disaster is an upgrade opportunity :-)

Any advice would be greatly appreciated.
D

[Paulice]

Laptop battery's have them also, I found on an old laptop that had a life span of about 2 mins on the battery pack, so i opened it up and checked the charge, it was low but not charging, so i charged the battery with another charger after disconnecting the electronics and reconnected it then back into the lappy, still no life, 2 min's and power off, buy a new battery and all was ok again, So it seems to me the electronics is not just a charging hardware but also a cycle software so many cycles and your stuffed into getting a new one, unless someone knows a way to re-set them to 0

[maddog7]

Hi Paulice,
You could very well be right, designed obsolescence. The only difference is that laptop batteries have multiple connectors allowing them to be balance charged through the taps, effectively.
D

[cjcj1949]

You could try your lamp out with different volts and see what volts you need to get the same light as before.

[st200ol]

I would guess its a protection circuit to protect the battery from over/under charge etc.

You can use the battery without it as long as you are careful.

[url=http://www.batteryfacts.co.uk/BatteryTypes/LiIonProtectionCiruit.html]Li-ion Protection Circuit[/url]

[maddog7]

[QUOTE=st200ol;931187]I would guess its a protection circuit to protect the battery from over/under charge etc.

You can use the battery without it as long as you are careful.

[URL="http://www.batteryfacts.co.uk/BatteryTypes/LiIonProtectionCiruit.html"]Li-ion Protection Circuit[/URL][/QUOTE]

I think it might be a combo balancer/charger/protector.

I used it last night anyway and it lasted about 2 hours, roughly half what it should, which suggests the batteries are a bit goosed anyhoo.
At least it didn't blow up my light!
I'll get some replacements off the bay!
Cheers all.
D