Why Skil 18V Li-Ion battery lights blinking fast ?

Question edited for a lot more clarity. All questions need full 'make model (what it is)' please.
Question moved from Garden to make model category.

It is this one with wildly differing prices!

https://www.google.com/search?q=Dewalt+DC9096+charger

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Replacement for Ryobi P107 Power Tool Battery

• Type: Li-ion
• Volt: 18V
• Capacity: 6000mAh
• Color: Black
• Weight: 898g
• Dimension: 135.70 x 76.00 x 107.30mm

http://www.drill-battery.net.au/buybatteries.php/ryobi_P107_power+tool+battery.html

• Type: Li-ion
• Volt: 18V
• Capacity: 6000mAh
• Color: Black
• Weight: 898g
• Dimension: 135.70 x 76.00 x 107.30mm

hi Terry.
you could try homebase.or ebay will have them.
or this link should show you where you can buy them.
battery charger for ozito drill Google Search

ITS LOADING if green light RAPID BLINKING SLOW BLINKING YOU HAVE LI-ION BATTERIES THE BEST IS TO HAVE THEM ALWAYS ON THE LOADER IF IN USE ; THERE IS NO MEMORY EFFECT OR TRAINING NECESSARY THAT WAS THE NICKEL CADMIUM PERIOD OF THE HEAVY BATTERIES , when a li-ion battery is too long without charging and using on time when the battery is below the dc level it should have it is possible that the loader will not accept the battery anymore, no problem take 2 short wires of a powercable and from a full loaded battery take the + connector and connect to the + with the problem battery and also the - to the - and wait for a moment 4 or 5 minutes that should be enough so the deep unload protection level is high enough loaded to accept the battery again on the loader MAKITA HITACHI MILWAUKEE DEWALT and much more brands its the most safe solution to get that dead battery working again. because not always is there a real problem but when too long inactivity 1 or 2 years on a li ion battery it is not dead or have only used one battery too long without changing it

Yes you can. On tools, 18 volts is 18 volts. Tools don't 'know' how the power is being created, either by Ni-Cad or Li-Ion means. Chargers are totally different. Most Li-Ion chargers can charge older Ni-Cad and some Ni-MH batteries but older Ni-Cad chargers will charge Li-Ion battery untill they overheat and sometimes start on fire because older chargers can't detect when the Li-Ion batteries are full.

Some of the Makita 18v LXT tools require the BL1830 3.0AH battery and are designed that the 1.5AH battery will not fit.

I did get an educated electronics eng. tell me li ion batteries 4handtools,are manufactured to only be recharged a set number of times,to avoid tool damage.

unplug charger to let it reset. plug back in and then try again, if it still flashes red/green that would indicate a battery failure. check for warranty replacement.

I would return it and tell them that the battery wont work.

your batteries are toast;must replace