| **Reel Slots** Gaming Machines > Bally Reel Games |
| E-2000 MPU board Li Ion battery mod |
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| Newb:
Got it. So right now the flat top battery that is on the board is connected with tabs on each end to make the contact with the battery, it appears to be soldered, however, since I cannot just pull it out. Any idea how do get it out, and would I be able to use those same tabs that are already soldered to the board? The new battery is also a flat top (same size) and rechargeable. |
| MartynH:
Badbaud, I have a question. I recently replaced the original battery on an E2278 MPU with a Li-Ion one. Seems to be fine but I did not replace the resistor with the low voltage drop diode that you mentioned. What is the purpose of adding this diode? |
| Badbaud:
5 Volts is trying to charge the 3.6V LiIon battery through the resistor. I have encountered 2 boards where the LiIon battery blew up due to excessive voltage. The diode is used to prevent the 5V from reaching the battery but allow the 3.6V to power the RAM chips. The diode specified has a .3V forward voltage drop and allows the battery to provide 3.3V to the RAM chips. If you use a standard silicon diode like a 1N4001 it's forward voltage drop is around .7V so the RAM only gets 2.9V from the battery. |
| MartynH:
Thanks for the detailed answer. Okay its a 20V 1A Schottky diode. I'll get one installed before anything blows up! |
| Chaos:
Reply moved to its own thread |
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