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Jarrod and I use 20 AH nicad batteries in our HID cave exploration lights and get 13 hours burn , but this is not necessary for most diving. The canister is 1/4 inch wider than for the 14 AH lead acid ( the nicads are 20 ah at a one hour rate, the lead acid 14 at a 20 hr rate). The problems are that charging is expensive, the battery tabs and connections must be spot welded or you lose voltage, and the batteries are finicky so you need plenty of spares at $80 per cell ( they can only be bought in a 24 cell box ). Nicads ( dry cell nicads ) do not offgas hydrogen unless the polarity of the cell is reversed. Nickel metal hydride batteries are severe offgassers. Hand held lights that use them have vents. Nicads offgas oxygen during charging which is reuptaken at the anode. The big thing that you have to look at is what the light does besides light. If you have some pee wee herman canister with cute little NmH batteries, you have defeated the removable weight aspect of a canister light. A normal HID with a 14 ah battery, like the Extreme Exposure ( EE ) lights that the WKPP uses for most dives , lasts five hours with the regular sized bulb. JJ and I use the normal light for all dives other than the ones that have bottom times exceeding the 14 ah capacity. By the way, I noticed a discussion on here of what HID light is best. Simple question , "What do the pros use and why?" One answer I can give you is that anyone with the tiniest clue would not have a non-focused or non focusable beam. That shows somebody who does not get it in any way. -----Original Message----- From: fossildiver@mi*.co* [mailto:fossildiver@mi*.co*] Sent: Tuesday, April 03, 2001 1:11 PM To: techdiver@aquanaut.com Subject: Re: Canister Lights / Bitz Mike Rodriguez <mikey@ma*.co*> wrote: >It's the other way around; most canister lights use lead-acid >batteries, *not* NiCad. I have seen a HID with a small 9AH canister with NiMH batteries. The reading I've done on these batteries leads me to believe that outgassing isn't a problem unless they are discharged far beyond the point at which the HID light will stop working. Is there a reason I'm missing to not use these batteries with a HID? al -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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