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3.6v Lion batteries much be charged with caution.

If the voltage drops below 2.4V or exceeds 4.5v they can begin to leak lithium, which as you may already know, reacts violently with water and to a lesser extent oxygen. Similar to the way sodium reacts.

For this reason Lion battery cells have an inbuilt protection circuit to prevent them from going over and under charge.

Normally electronic chargers are used to charge the battery in stages, and this is by far the best way...

However, if in the absence of these, you may find an LM7805 (or other breed of 7805 chip) regulator IC to bring 6 volts down to 5. You could then use a 1N4004 diode and a 1k ohm (1watt) resitior in series with the positive line to limit the charge current.

I would not recommend this, as it is an emergency sollution only, and you could seriously damage or explode the battery if this is left attached to the abttery more than a couple of minutes.

The components mentions are salvagable from a great many devices, and can be used in an emergency situation to power or charge a mobile telephone for instance.

If in doubt, purchase a USB phone charger from Ebay (cheaply), and feed the power connections with 5vdc. the resulting output should be suitable for a Lion 3.7v pack.

for usb pinouts go to www.pinouts.ru

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13y ago

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