4.5V battery

"Michael C"

• Yeah right - like all " watch batteries" are exactly the same size.

........... Phil

If you have power available all the time it's no more difficult to design and build a voltage regulator to eliminate batteries than a battery charger.

AFAIK you won't get any rechargeable batteries that are compatable in size to watch batteries.

Nor are watch batteries all the same technology. The best and most expensive are silver oxide, for which cheaper options exist if the voltage stability isn't critical.

-- John H

Hi John,

The device is USB but it is wireless so won't always have power. I do have a fair bit more space than the 3 watch batteries, probably enough for a single AA battery. I was thinking that I could have a usb plug on the device that was used for charging only, instead of supplying the customer yet another charger.

Michael

"Michael C"

Go check the WES catalogue for Akai Video Backup Batteries.

Cat # BVS8 = 4.8 volt, 80 mAH.

Costs = $10 .

........ Phil

WES Components at Ashfield (NSW) list a 1.2V 80mAh NiMH that measures

Four in series would give you 4.8 volt.

-- John H

When I originally posted I didn't have that much space but came up with a better way to do it.

Thanks phil, I'll give them a call next week.

On Sun, 09 Oct 2005 19:49:48 +1000, John_H put finger to keyboard and composed:

How would you go about charging them from a 5V source?

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

"Franc Zabkar"

.......... Phil

What's one of them then?

Michael

"Michael C"

......... Phil

LM2750 -- $5.81 from Farnell (awaiting stock).

-- John H