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majid_sabet
Feb 8, 2008, 8:06 PM
Post #1 of 4
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Registered: Dec 13, 2002
Posts: 8390
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Most batteries for rechargeable wall drills are not cheap however ,you could use an alternative batteries such as APC computer backup battery or similar 12 volt batteries which will cost anywhere from $15 to $30 a piece vs.$100 for the oem battery.
To recharge a 24, 36 volt homemade battery using two or three 12 volt batteries, you have two options;
1- you can either disconnect the batteries from your rig one by one and charge them by car charger or wall charger
2- You could charge both batteries without taking the batteries apart but you need to add a dual position toggle switch ($3-5 ) with following wiring configuration.
The toggle switch must be a dual switch meaning, it has 6 wire contacts with 2-5 Amp rating. Once you rewire the switch to batteries with this configuration, you could select the switch to either charge both batteries at once using the 12 volt power supply or run the drill.
Switch and the wiring stays within your homemade battery pack. Car charger male (cigarette lighter) adaptor can be part of the battery pack if you choose too however, the wall charger and drill should have quick male/female connection so you could easily remove drill while batteries are getting charged.
Requirements for the 24 volt external battery pack;
One dual position toggle switch (sw tg) is shown with how to connect 6 wires. You select switch to side # 1, it charges and select to other side #2 , it supplies power to drill.
Two 12 volt barratry (computer backup APC, alarm or similar sealed batteries).
2-4 feet of proper size wire ( old extension cord, electrical wire etc)
Car charger plug (you could use an old cell phone car charger plug)
Two male /female plug (check ebay $3 each from china)
[URL=http://imageshack.us]
[URL=http://imageshack.us]
[URL=http://imageshack.us]
The 36 volt battery setup is similar to the 24 volt except; the toggle switch has to have 12 contacts as shown. Here is the link for similar looking toggle switch:
http://images.google.com/...fe%3Dactive%26sa%3DN
Here is the 36 volt external battery wiring configuration as of Feb 11-2007;
[URL=http://imageshack.us]
[URL=http://imageshack.us]
http://img527.imageshack.us/img527/4474/tglswbj2.45bfbcf6fb.jpg[/IMG]
MS
(This post was edited by majid_sabet on Mar 5, 2008, 8:27 AM)
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reg
Feb 8, 2008, 8:41 PM
Post #2 of 4
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Registered: Nov 10, 2004
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don't you have a dead short from blue to red in the run mode?
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majid_sabet
Feb 8, 2008, 8:44 PM
Post #3 of 4
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Registered: Dec 13, 2002
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reg wrote: don't you have a dead short from blue to red in the run mode?
No, all Vs are cross over cables and are not shorted.
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reg
Feb 8, 2008, 8:57 PM
Post #4 of 4
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Registered: Nov 10, 2004
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no - i mean the upper sw terminal w/blue neg. wire from the righthand batt. - when u switch to run your putting that blue right to the red of the of the lefthand batt. - oh never mind i see it now - that's giving you the 24 - drill on
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