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Old 12-09-09, 11:33 AM   #1
bobn
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Converting a Cat Eye Opticube

I have a Cat Eye HL-EL 300. It uses 4 AA batteries. Can I use a sealed wet cell battery instead of the 4 AAs?

The wet cell is rechargeable and is 6V 4.5 AH. Would this battery be too much for the led electronics?

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Old 12-09-09, 12:15 PM   #2
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Shouldn't matter at all. If it can take 4 AA NiMHs, it knows how to regulate current, because 4 NiMH AAs are fully capable of dumping enough current into that sucker to light it on fire. If it can handle that, it can handle a 6V SLA battery.
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Old 12-09-09, 12:42 PM   #3
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Originally Posted by ItsJustMe View Post
Shouldn't matter at all. If it can take 4 AA NiMHs, it knows how to regulate current, because 4 NiMH AAs are fully capable of dumping enough current into that sucker to light it on fire. If it can handle that, it can handle a 6V SLA battery.
+1 I agree.

6 Volts is 6 Volts. As long as the voltage is compatible, should be fine. The only issue with using different battery technology is when the device has some "smart power management" capability. The worst that can happen in this case is the device might shut down due to sensing "low battery capacity" before the "different" battery is truly exhausted. Generally a small annoyance if it occurs at all.

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Old 12-09-09, 01:10 PM   #4
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6 Volts is 6 Volts.
Yes, but it's not quite that simple.

A 6v SLA battery will actually put out about 6.6 or so volts when fully charged. Four alkaline AA cells will start at 6.0 volts and go down from there. (Four NiMH AA cells will start at about 5.6 volts and go down from there, just to cover all the bases, even though 4 x 1.2 volts is 4.8 volts -- NiMH and NiCd cells start at 1.4 volts fully charged, even though people call them 1.2 volt batteries.)

It's likely that the SLA battery will be just fine -- 6.6 volts is pretty close to 6.0 volts -- but the voltages aren't exactly the same.

Actually, there is one other possible problem. It's possible that the light puts the batteries into parallel and works off of 3 volts instead of 6 volts. Or perhaps it leaves them in series to get 6 volts, but also connects to the batteries somewhere else so it can get 3 volts. This is unlikely, but it's certainly possible. I've got one of these lights, but don't quite remember what the wiring inside looked like.

Last edited by dougmc; 12-09-09 at 01:13 PM.
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