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Old 12-23-2003, 12:45 PM
Junior Lounger
Join Date: Sep 2003
Posts: 68

Haha, i did a thread along these lines a few days ago, but i guess being a moderator lets you make your own threads sitcky and ignore ones done by other users.

this is from my other thread:

Here's some Battery advice, I've lifted completely from Battery Universe I hope you find it helpful.

The iPod has a Lithium-ion/ploymer type battery, these commonly are only rated at 300-500 charges; the iPod in my experience has been rated at 500, (you will see why this firgure isn't anything to worry about).

Lithium-ion is a low maintenance battery, an advantage that most other chemistries cannot claim. There is no memory and no scheduled cycling is required to prolong the battery's life. In addition, the self-discharge is less than half compared to nickel-cadmium, making lithium-ion well suited for modern fuel gauge applications. lithium-ion cells cause little harm when disposed.

A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often. There is no concern of memory when applying unscheduled charges.

Some sound advice:
# Avoid full discharges; recharge lithium-ion more often. Repetitive random charge does not harm the battery. There is no memory.
# Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.
# Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing date. Do not buy old stock, even if sold at clearance prices.

Some Do's and Don'ts:
#Do charge the battery often. The battery lasts longer with partial rather than full discharges.
#Avoid full cycle because of wear. 80% depth-of-discharge recommended. Re- charge more often. Avoid full discharge. Low voltage may cut off safety circuit.
#No maintenance needed. Loses capacity due to aging whether used or not.
#Store at 40% charge in a cool place. Do not store at full charge and at warm temperatures because of accelerated aging.

How to Charge and When to Charge:
Should I use up all battery energy before charging?
No, it is better to recharge more often; avoid frequent full discharges.
Yes, on batteries with a fuel gauge, allow a full discharge once a month to enable reset

Should I charge my battery partially or fully?
Does not matter. Charging in stages is acceptable. Full charge termination occurs by reading the voltage level and charge current. Charging a full battery is safe and does not cause harm.

Should the battery be kept charged when not in use
Best to store at 40% charge. Cool storage is more important than state-of-charge. Do not fully deplete battery because Li-ion may turn off its protection circuit.

Will the battery heat up during charge?
No, little heating is generated during charge. A large laptop battery may get lukewarm. Do not allow the battery to heat during charge. [If charging the iPod in a dock connected to a PC & if the drive is mounted; the Hard Drive head will still spin, and it will heat up].

What should I know about chargers?
Charger should apply full charge. Avoid economy chargers that advertise one-hours charge. Fastest full-charge time: 2-3 hours.

All info from Battery Universe written up by Isidor Buchmann; founder and CEO of Cadex Electronics Inc., in Vancouver BC. Mr. Buchmann has a background in radio communications and has studied the behavior of rechargeable batteries in practical, everyday applications for two decades. Award winning author of many articles and books on batteries, Mr. Buchmann has delivered technical papers around the world.

Last edited by saqib; 12-24-2003 at 10:25 AM.
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