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Topic: li ion battery connection trouble (Read 394 times) previous topic - next topic

noeljacob481

Hi guys, i was making a robot this week. And suddenly i came to think about the batteries. I was planning to use 2 li ion cells from old nokia cell phones. I happened to read about handling these cells and it says that u have to drain them bfore soldering. It also says that we have to use a balance charger. So heres what i had done so far.
1. I took two 3.7v cell phone batteries ( to make 7.4v)
2. I drained them using the phone and a couple of bulbs

Now what shud i do? Here r my questions
1. How shud i wire the two batteries so that i can charge it again with a balance charger?
2. Shud i take the current limiter out?
3. Is it safe to solder?

Please help

MarkT

Draining a battery to 0V destroys it.  Draining it to 10% charge won't help you solder anything
to it.  Soldering may start a fire, dont do it, you need mechanical sprung contacts to safety connect.

If you modify the batteries they become as unsafe as a bare LiPo battery, so treat them as such.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

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