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The Muthalode of battery information ...(7 posts)

The Muthalode of battery information ...Humma Hah
Nov 5, 2001 4:42 PM
... At work, we're building some stuff that uses large banks of rechargable batteries, and I've come across some interesting information. I know this topic comes up here with regard to lighting systems, so I thought I'd share.

For a comparison of the various types of primary (use and discard) and secondary (rechargable) batteries, check out:

http://www.houseofbatteries.com/Design.htm

The upshot: there are a few exotic primary batteries that outpreform alkalines, but not by a whole lot. None of the rechargables come close. NiCads do not have quite the energy density of NiMH, but can be charged and discharged faster. Lithium Ion batteries out-perform them both, but at high price (these are now the preferred camcorder battery, and they are impressive).

A co-worker, quite the expert battery RC aircraft modeler, says the RC crowd will not touch any nicads except for Sanyo's, especially the fast-recharge models.
Do you have a preference?Alex-in-Evanston
Nov 6, 2001 7:18 AM
I've got a 12W NiMH light that works well for me. I have no problem sacrificing quick charge time for longer run time. If I ride two hours at night, I just give it a 24 hour charge and I'm ready to go the next day - what more would a guy need?

Just out of curiosity, do any bike light makers use lithium ion?

Regards,

Alex
Do you have a preference?DA
Nov 6, 2001 8:24 AM
Prob not necessary with 4 hr run times and amazing brightness of metal halide arc bulbs (Niterider HID- AWESOME!).
Have some batteries I definitely avoid ...Humma Hah
Nov 6, 2001 7:16 PM
We presently have about 160 Panasonic nicads which we first thought were awful, turned out to be a busted charger. I've put them thru the wringer and they seem OK.

Steer clear of the Infinity batteries which were sold by Price Club. Truely awful. Among other things, freezing destroyed them (nicads should stand freezing easily).

I've had poor luck with most off-the-shelf brands, including Radio Shack.

Whatever ICOM puts in their handheld radios are terrific.

I await lithium ion batteries in bike lights eagerly. The one in my camcorder is a true marvel.
I'm running a NiMH too, recharges in about 4 hours ...Humma Hah
Nov 6, 2001 7:12 PM
... I use a 10W light, typically burn it 45 minutes on a 2200 mAH battery. 24 hours is kinda long. I use a timer to be sure I don't charge it overnight.
What about though...Sparky
Nov 6, 2001 8:33 AM
Good Ol' lead acid - like my CatEye rechargable system?
Lead acid has fairly low energy density ...Humma Hah
Nov 6, 2001 7:18 PM
... particularly judged by weight. They're economical, however, and great for fixed installations.