Thinkpads Forum

I have ThinkPad 770.
The problem is the battery. The button at the left side for turn on the laptop has it's strange behaviour.

1. The battery does not do it's job for any seconds. Means I have to have the DC electricity connector all the time connected.

2. If I pull out the DC connector, the laptop turns off immidiately.

3. If I connect laptop to charge itself (DC connector in) the green LED turns on for few seconds, then goes blinking during hours.

4. Percentage at the small "screen" shows sometimes 100%, then sometimes 0%.

Is this problem linked to bad circuits (turn on / off button, battery....)?

Anybody has similar / the same problem?

I think you have a bad battery that will no longer hold a charge. To fix it, you need to buy a new battery. If you want to test this, you need to find someone with a good battery for you to borrow and see if it runs okay with a good battery.

Phil.

pkiff wrote:I think you have a bad battery that will no longer hold a charge. To fix it, you need to buy a new battery. If you want to test this, you need to find someone with a good battery for you to borrow and see if it runs okay with a good battery.

Phil.

Thanks!

There's big possibility of battery being bad.

What do you think about a replacement of battery cells inside the bad battery? I do have friends with good knowledge of it - they already made (assembled from cells) batteries for Toshiba's, Acers, some other laptops. Of course, they have to make the same type (NiMH, as I think), voltage / current, capacity.

I do not know if IBM battery has thermistor inside itself (to check battery temperature, if it's above normal working temperature, to avoid bigger problems).

AldoPervanic wrote:What do you think about a replacement of battery cells inside the bad battery?

I don't know how to do it. There are companies that do this all the time, so it is certainly possible.

If you are using Lithium Ion batteries, however, I think there may be a danger of explosion under certain conditions. And if you put it together wrong then I suppose you could burn out your motherboard or something.

I think the 770 series can use either a NiMH pack or a LiIon pack, and I gather the NiMH may be easier or safer (?) to work with. There is definitely some kind of circuitry inside the battery that you will have to disconnect and reconnect. If your friend knows what they are doing then I would say go for it, but I can't offer any assistance. Perhaps there are others on the Forum who know more about this.

Phil.

pkiff wrote:
. If your friend knows what they are doing then I would say go for it, but I can't offer any assistance. Perhaps there are others on the Forum who know more about this.
.

Thanks;

I just take the battery out the laptop, I checked it with the multimeter, it does have perfect voltage, I'll go to friends to check the current (DC) it has under load.

Something is wrong, and I do believe it's not battery, but the circuit close to the battery.