Refill a phone battery?

I have a phone which I don't use it for quite sometime. Why? Becoz I just can't get the battery in the market! Nowadays a phone is considered very cheap already. Instead of purchasing the spare part, most people will rather buy a new phone. I get the below battery which cost me around RM15 at Low Yat first floor, it is cheap, but I only manage to use it about 3 months. Initially, it standby about 3 days, but the performance drop dramatically after a few weeks. Open it out, I found that they were using some used NiMH cells inside the battery. Honestly, for the price I have paid, I really can't complain much about it. Beside, I know that Sanyo don't make those cell anymore, I wonder who are their target user... Now, everyone use Lithium ion type cell which promise to give you light weight and longer standby time than Ni-MH.

So what to do next? I decided to change the cells to Li-ion cell to see how would it be. I open up the battery housing and see three pieces of second hand used Ni-MH cells which is manufactured by Sanyo inside.

Since the cells I put in is much thicker than battery housing, it have to cut a opening at the back of the housing.

Done! This 1800mAH 3.6V cell give me standby more than 10 days! Off courses I don't bring this phone along, it is very dangerous to bring too. And it just no too safe to be charged up by using original charger since Ni-MH and Li-ion cell is charged with different algorithm. I use an external charger to charge it directly from the back instead. Look like a remote controlled bomb? The component at the back just play the role of simulate the single Ni-MH cell Voltage level, this will be used to report the power status or power meter on the phone, otherwise the phone keep come out with beeping and show "Invalid Battery" in the LCD screen.

Please don't feel strange about this article, just some personal hobby, everyone have hobby. Life can be bored without any hobby. Please don't imitate, if you want to do this, make sure that you understand what you are doing. I don't pay any responsible for what the risk you will take if you imitate this. Furthermore, this is not a practical way to use a phone.

P/S: If you want to use any information and picture on this page, please copy also the link to this page, isn't it simple? Thanks.