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Old 05-04-2012, 10:10 AM   #16
matt3k
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Default Re: A3000 battery
Quote:
Originally Posted by mechy View Post
No offense ,but i think its dumb to mount ANY battery in a amiga that can leak when there are better alternatives like coin cells.
what you guys don't realize is the leaking batteries often outgas when they leak which is why on some amiga boards you may see corrosion far away from the battery on other components.the fumes inside the case travel.

If you don't like the typical 3volt CR2032 cells, use the LIR2032,its a rechargeable coin cell lithium that fits inthe same cell holder (you must still use the diode),but it starts at 3.6v instead of 3v and will generally be better off with the diode voltage drop and last longer. there are external wall chargers to recharge this coin cell,like the old cr2032, again it should never be charged by the amiga.

The 3000's battery mem holds several things, it allows the use of LUNS,it holds time and date,and allows you to set scsi into synchronous mode for better speed. it also holds settings for Speeding ramsey for ram access if i recall.

Mech
Hi Mech,

Excuse my ignorance in the matter. Cells type batteries will never leak? If true then this would be the best approach.
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Old 05-04-2012, 10:29 AM   #17
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Default Re: A3000 battery
I'm not worried about my replacement battery leaking because it's sealed in shrink wrap. The A3000 will boot using default SCSI settings without a battery but if you want to use synchronous mode or need the long SCSI time out you need a battery! Also, certain disk utilities will report an error if you have files newer than the boot drive creation date.

You don't need the battery for "SpeedRamsey" you just need Ramsey 07, but if you have fast enough memory you can just set the Ramsey Speed jumper to 16 MHz.
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Last edited by SpeedGeek; 05-04-2012 at 10:32 AM..
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Old 05-04-2012, 11:29 AM   #18
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Default Re: A3000 battery
You also need the battery to enable LUNs (SCSI card reader, etc.). Can't boot to my CF card without LUNs enabled.

I don't think that shrink wrap will stop battery leakage, but I'm no expert.
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Old 05-04-2012, 01:30 PM   #19
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Default Re: A3000 battery
Quote:
Originally Posted by matt3k View Post
Hi Mech,

Excuse my ignorance in the matter. Cells type batteries will never leak? If true then this would be the best approach.
that is correct, the lithium coin cells do not leak.

NiMh and original nicad barrel style can both leak and cause damage.

Its a misconception that NiMh is a safe replacement,it is not.

Mech
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Old 05-04-2012, 05:42 PM   #20
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Default Re: A3000 battery
If you use 3volt CR2032 cell with the holder, do you still need a diode with it? I see some for sale with out it. Or if used a 3.6v phone battery, do you need a diode with that? lol or is it just easy enough to say use a diode with every battery but the barrel type. Sorry don't know much on this and rather ask looking stupid then pull a stupid and do it wrong.

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Old 05-04-2012, 05:53 PM   #21
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Default Re: A3000 battery
Quote:
Originally Posted by lost_loven View Post
If you use 3volt CR2032 cell with the holder, do you still need a diode with it? I see some for sale with out it. Or if used a 3.6v phone battery, do you need a diode with that? lol or is it just easy enough to say use a diode with every battery but the barrel type. Sorry don't know much on this and rather ask looking stupid then pull a stupid and do it wrong.

lost
You need a diode if you will be using a non-rechargeble battery becouse the motherbaord will be trying to charge the battery when turned on. the phone battery can be recharged therefore you do not need the diode.

The diodes job is to let the current only move in one direction so the motherboard will not be able to deliver any to the battery, the battery will only be able to deliver to the motherboard.
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Old 05-04-2012, 09:21 PM   #22
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Default Re: A3000 battery
Quote:
Originally Posted by Kawazu View Post
You need a diode if you will be using a non-rechargeble battery becouse the motherbaord will be trying to charge the battery when turned on. the phone battery can be recharged therefore you do not need the diode.

The diodes job is to let the current only move in one direction so the motherboard will not be able to deliver any to the battery, the battery will only be able to deliver to the motherboard.
Wires to a rechargable phone battery away off the motherboard is the best idea. Sometimes a 2032 lithium coin battery will still drop the RTC because they are only 3v and the Amiga's RTC chip expects 3.5v.

Not having a diode in the circuit and alowing a 2032 lithium coin battery to charge will lead to VERY undesirable results.
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Last edited by gertsy; 05-04-2012 at 09:44 PM..
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Old 05-05-2012, 12:56 AM   #23
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Default Re: A3000 battery
Quote:
Originally Posted by gertsy View Post
the Amiga's RTC chip expects 3.5v.
I thought the chips usually run about @ 2+ Volts (my A500 expansion did have a 2.4V battery...)
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Old 05-05-2012, 04:11 AM   #24
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Default Re: A3000 battery
Seems like there isn't a consensus that the lithium coin cell is the optimal choice for battery solution.

So far:
+
Coin Cells will not leak.
Phone batteries can be recharged and therefore don't need a diode.
Both solutions can be mounted remotely.

-
Coin Cell will explode without proper installation of the diode.
Phone batteries are still prone to leak over time.

Anyone want to point out other +,- ?.
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Old 05-05-2012, 06:25 AM   #25
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Default Re: A3000 battery
Quote:
Originally Posted by gertsy View Post
Wires to a rechargable phone battery away off the motherboard is the best idea. Sometimes a 2032 lithium coin battery will still drop the RTC because they are only 3v and the Amiga's RTC chip expects 3.5v.

Not having a diode in the circuit and alowing a 2032 lithium coin battery to charge will lead to VERY undesirable results.

That is exactly what i did with my phone battery if you take a look at the pictures i posted on the first page.

Using the same solution on my 3000T
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Old 05-05-2012, 07:32 AM   #26
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Default Re: A3000 battery
LIR2032 lithium coin battery is 3.6V.
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Old 05-05-2012, 07:47 AM   #27
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Default Re: A3000 battery
Quote:
Originally Posted by Kremlar View Post
LIR2032 lithium coin battery is 3.6V.
Never even knew about these Kremlar. These are Li-Ion rechargable. No need for a diode and at 3.6v would seem to be purpose made for the Amiga...

What's more they're all over ePay.
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Old 05-05-2012, 07:56 AM   #28
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Default Re: A3000 battery
Mech lead me to these. However he still recommends the diode, but perhaps he can explain why.
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Old 05-05-2012, 08:26 AM   #29
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Default Re: A3000 battery
Quote:
Originally Posted by Kremlar View Post
You also need the battery to enable LUNs (SCSI card reader, etc.). Can't boot to my CF card without LUNs enabled.

I don't think that shrink wrap will stop battery leakage, but I'm no expert.
That's interesting that you need LUNs enabled to use a CF card. I would ask mechy if he knows how to configure your SCSI/CF adapter to work without LUN's enabled.

I don't expect the shrink wrap to stop battery leakage. It just expect it to contain it enough to prevent damage to the motherboard.

Also, since I don't need a diode I can expect the RTC/memory to run a lot longer than with the coin battery hack. The rechargeable battery charges to approx. 4 volts and has > 100x the current capacity of a coin battery.
Last edited by SpeedGeek; 05-05-2012 at 09:25 AM..
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Old 05-05-2012, 08:47 AM   #30
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Default Re: A3000 battery
Looks like the LIR2032 can be found for under $10.00 with a "smart" charger and 2 batteries (free shipping).

http://www.ebay.com/itm/SMART-CHARGE...item53ec97df4c

I am sure they can be found cheaper - but this easy....
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