[cft]

I have spare nokia 3120 and its original 800mah charger. It uses bl-5c but I can place bl-4c in it too (bl-4c is a bit slim). Because of the 800mah charger, batteries become full just in 45 minutes. So what I do? I remove the bl-5c battery from the phone and place the bl-4c battery (which was removed from the Glacier) into the phone, charging in 45 minutes and put into Glacier again, thats it!

Also I've found desktop chargers for this battery on the ebay.
search "bl-4c desktop"
You can use this with your nokia charger (most desktop chargers dont come with ac power supply on ebay, so you still need a charger)

Well as a result,
desktop charger + extra bl-4c battery + shipment + your own nokia charger = USD 7.18 on ebay
and they are full in 45 minutes

I think this is the best battery solution

Regards