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Old 03-29-2012, 09:57 AM   #16
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


Quick update in case anyone happens to have the same situation in the future. Ended up cutting down and stripping the branches from about 35 small trees on four charges total. I have two batteries, so took two trips. Everything seems to be functioning fine, both the unit and the batteries. As of now, I would say it's safe to do.

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Old 03-29-2012, 12:14 PM   #17
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


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Quick update in case anyone happens to have the same situation in the future. Ended up cutting down and stripping the branches from about 35 small trees on four charges total. I have two batteries, so took two trips. Everything seems to be functioning fine, both the unit and the batteries. As of now, I would say it's safe to do.
that is what is called field testing.
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Old 03-29-2012, 04:36 PM   #18
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


Just basic info from my military training. Volts are volts, if it uses 18 volts it should run on anything with 18 volts. 30AH rating means at a draw of 30 amps consistently it will take 1 hour to drain the battery. The motor will use however many amps it requires at at given time. (Ohm's Law) Just hold it at arms length in case it blows up.
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Old 03-31-2012, 10:08 AM   #19
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


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Originally Posted by sdsester View Post
Bad idea. Pay the piper.
Ayuh,.... Why is it a Bad idea,..??
'n who's gonna pay the piper, What,..??

The batteries are completely interchangeable...
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Old 03-31-2012, 11:39 AM   #20
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


If the only difference is the Ah (Amp hours, or Amps per hour), then the difference between the two batteries is literally the "size of the tank". Using the smaller one is like filling up your gas tank 1/2 way.
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Old 03-31-2012, 11:57 AM   #21
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


So what we've learned is that Makita is trying to sell more batteries.
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Old 04-10-2012, 02:34 PM   #22
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Modifying Makita reciprocating saw to use diff battery. Bad idea?


So, not for nothin’, but volts and amps don’t give you the full picture. There’s also discharge rate. That is: two given batteries could both be 18v & 1.5ah, but one of those could be capable of powering a saw which drains the 1.5ah in 10 minutes, while the other (perhaps designed for a drill) used under those conditions would overheat and damage the battery—or even rupture {although that’s an outside possibility}. You know how your cellphone battery gets really hot when you browse, or talk for a good while? That's the change in discharge rate.



My understanding is that safe discharge rate is dictated by the cells' configuration, cooling, and specific battery chemistry.



I think it’s TOTALLY possible that the 1.5ah batteries are designed with slow discharge in mind. Using them in a fast-discharge tool might shorten their life.



Of course, I have no way of knowing that. The batteries might be clones, and it might be just fine. Either way, I like the battery warranty, and don't want to sacrifice it. Better to modify the tool. They probably won't check that. =]

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