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The article mentions getting 7000 charge/discharge cycles from lithium ion batteries. That doesn't sound right to me. Most consumer electronics are lucky to get
by ansible 12y ago
The article mentions getting 7000 charge/discharge cycles from lithium ion batteries. That doesn't sound right to me. Most consumer electronics are lucky to get 300 or so at 100% discharge.
- lotsofmangos 12y agoAt 100% discharge, lithium batteries die.
- joosters 12y agon.b. most laptop / phone / tablet batteries have fairly sophisticated controllers built into them and the % charge you see on the device may not be the exact % charge in the cells. So running your laptop to 0% may still not be the full discharge (presumably to prevent this exact problem). That said, I did own a Sony laptop that had a battery saver option where it would limit the charge to 80% in order to prolong battery life. I can't remember if this actually meant "displayed charge = real charge - 20" or was capping the charge to 80%
- fulafel 12y agoPhone batteries make their own tradeoffs, they want to minimize weight and then make you buy a new phone. Marine li-ion batteries advertise 2000 full cycles (80% depth of discharge). Electric cars have 10 year battery warranties. Etc.
- ansible 12y agoIIRC, the current EVs run run their batteries at about 85% depth of discharge to meet their lifetime targets. Unless the linked article is talking about lithium iron phosphate technology. That is more durable than standard LiIon technology. But that isn't in wide use, despite its initial promise.
- manicdee 12y agoThe Tesla Powerwall is indeed based on LiFePO4, at least according to all the material Tesla have produced.
- kalleboo 12y ago> Most consumer electronics are lucky to get 300 or so at 100% discharge. AppleCare on their laptops stops being valid after 1000 cycles. I don't know what DoD they use for their calculation though.
- ghshephard 12y agoYou over provision to avoid 100% discharge (which would destroy a LiOn battery anyways)