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Yes you can. On tools, 18 volts is 18 volts. Tools don't 'know' how the power is being created, either by Ni-Cad or Li-Ion means. Chargers are totally different. Most Li-Ion chargers can charge older Ni-Cad and some Ni-MH batteries but older Ni-Cad chargers will charge Li-Ion battery untill they overheat and sometimes start on fire because older chargers can't detect when the Li-Ion batteries are full.
Hi, I would first ask if you are using a Ni-cad rechargeable battery system, these are not optimum performers for such a high drain microphone as probably the one you're using. Especially if the mic. takes a single 9 volt battery ( the average ni-cad 9 volt is about 200 milliamp hours, not a lot. If so-try switching to nickel metal hydride ( Ni-Mh ) these are better for high drain devices and do not develope a " MEMORY " effect ( which will cause rather sudden power loss ) memory effect can happen to almost brand new batteries as well, all it take to incur this is to charge a Ni-cad before it is totally dead. good luck, and thanks for choosing FixYa-Prodzilla
The AR AW721 headphones require 3 AAA NiMH batteries, not Ni-Cad. The original batteries are 1.2 volt, 550 mAh. I replaced mine with Energizer 850 mAh AAA batteries, which work well and actually last longer per charge than the originals.
Makita makes two 12V Ni-Cad pod batteries: Battery 1222/2.0Ah (PN: 192598-2) and Battery 1220/1.3Ah (PN: 192681-5). Makita's universal charger (PN: DC1804) will charge any Ni-MH or Ni-Cad pod or stick battery from 7.2V to 18V.
Remove Phillips head screw at bottom of trimmer. Separate body in two being careful to notice how on/off switch is assembled. Unsolder the ni-cad battery from circuit board.
Install new ni-cad battery of the same physical size that
has solder tabs on it and solder it to the circuit board.
I used a ni-hi (nickle metel hydride) instead of ni-cad
which had different charging requirements so I limit charge time to no more than 16 hours for a discharged battery. It had been working fine for over a year. Don't forget to apply a few drops of light oil to the cutting blades to extend cutting life. Replacement blades are about $30.00
Are you using Ni-MH batteries? Most other batteries including Ni-Cad just dont have the punch that the Ni-MH has amperage wise. You could try Lithium batteries, but many devices are explicit on the battery type.
If you bought ni-cad batteries then you may have recharged them incorrectly and they do not have a good charge. Try fresh non-rechargable batteries.
If you bought ni-cads, buy nickel-hydride next time. They do not have a "memory" issue like Nicads.
I think the key here, though, is that it was dropped....