快充会不会伤电池?

这个和手机无线充电的用法类似，随时随地充电。 但是，我一直有个疑问，锂电有充电次数限制吗？
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看样子铁坨子985也要更新无刷了。

Earlier this month I posted a few thoughts about whether or not I thought Dewalt was soon coming out with a new 20V Max XR brushless premium hammer drill or drill/driver. It’s a question I have been asked numerous times via email, and so I wanted to address the question in a post that I could point to when responding to similar emails moving forward.

Given Dewalt’s past marketing approach, I really didn’t think a brushless version of their cordless premium drill and hammer drill were scheduled for release in the near future. It looks like I was wrong.

In a comment to that predictions post, a reader mentioned to expect Dewalt’s premium brushless drill driver/hammer drill to be out around October. While a Fall 2013 ETA has not yet been officially confirmed, I was able to track down some early information about the new brushless hammer drill.

Most noticeably, it looks like Dewalt was able to engineer the brushless premium hammer drill to be slightly more compact and shorter in length than the brushed motor premium drill. The hammer drill still looks a bit long, but any improvements in length are well worth it.

As Javier pointed out his comment below, unlike the brushed motor premium cordless hammer drill, DCD985, the new DCD995 brushless premium drill does not have a separate mode-selector switch. Instead, the rotary and hammer mode settings can only be toggled by rotating the adjustable clutch wheel.

If accurate, the 80 Nm peak torque rating (~708 in-lbs), means that the new Dewalt premium brushless hammer drill is less powerful than Milwaukee’s brushless Fuel hammer drill, as well as Bosch and Makita’s brushed motor hammer drills, according to those brands’ torque ratings.

The new brushless hammer drill also received similar styling and design tweaks as Dewalt’s compact brushless hammer drill, and drill/driver. It has a new bottom base-mounted LED worklight, a design decision that seems to have been borrowed from other brands, a the new dual-color pistol grip styling to differentiate this as a brushless XR drill.

In terms of general technical specs, our sources say that the XR brushless premium drill will have the same 3 speed ranges as the brushed version, the same weight, and the same maximum torque rating. I cannot confirm this just yet, but official details and specs should be available closer to the tool’s launch.

Speed: 0-575, 0-1350, 0-2000 RPM
Weight: 5.3 lbs
Peak Torque: ~708 in-lbs
Chuck: 1/2″
Clutch positions: 22
The brushless XR premium hammer drill (DCD995M2) will be bundled in a kit with 2x 4.0Ah lithium-ion battery packs, and an impact driver combo kit seems probable.

Right now I have not seen any information about the non-hammer brushless premium drill/driver, but my guess is that it will probably be launched around the same time.

Pricing information is not yet available.

Dewalt Premium Brushless vs. Milwaukee Fuel

Milwaukee’s M18 Fuel brushless hammer drill is currently one of the most popular cordless drills on the market, and stands to be the top competitor for Dewalt’s new brushless premium drill. A lot of the readers that have asked about a possible Dewalt premium brushless drill release have also asked about whether they should just skip the wait and buy into Milwaukee’s M18 lineup for their Fuel brushless model.

In terms of size and weight, Milwaukee’s M18 Fuel drills bested Dewalt’s brushed motor premium drills. In terms of sheer power, both tools came close. In terms of runtime, it seems that the Milwaukee had the upper hand with its brushless motor, but I don’t recall seeing any recent head-to-head tests. One of the main selling points for the Dewalt over the Milwaukee was its 3 speed settings.

Milwaukee’s brushless hammer drill has a higher torque rating than the Dewalt – 725 in-lbs vs. ~708 in-lbs, when paired with a high capacity 4.0Ah battery pack. But that’s on paper.

In practice, there are other factors – such as battery over-current protection – that could contribute in determining which tool is really more powerful than the other when it comes to real-world applications. If you are pushing either tool to their limits, a few inch-pounds of on-paper torque rating won’t make a difference.

If you ask me, I would go with the Milwaukee Fuel over Dewalt, but that’s because I prefer its lighter weight and smaller size, and its 2- speed ranges would suit me just fine. I also prefer how Milwaukee’s auxiliary handle fits to the tool, compared to Dewalt’s method.

A Note About 20V Max “XR”

As with other recent Dewalt 20V Max cordless tools, the new cordless drill features “20V Max XR” branding. 20 V Max XR has been a source of some confusion for USA users, who have been asking if Dewalt’s XR lithium ion batteries provide any improvements in performance, as with Milwaukee’s RedLithium and XC battery packs. According to an answer by Dewalt on their Facebook page, the XR battery packs only provide added runtime, not added performance, compared to Dewalt’s lower capacity non-XR batteries.

Shown above is the European version of the tool, which has 18V XR and XRP branding. 20V Max is just a way of marketing the 18V Li-ion tools to North American customers. In the past, Dewalt marketing said this was to avoid user confusion, but now users are faced with having to make sense of 20V Max XR.

DWE7490X: 26-1/4″ x 22″ table surface, 28-1/2″ rip capacity, weighs 57 lbs (table saw only), includes a compact folding scissor stand, $499.

这个充电方式单指电动工具的锂电池？为啥别的电器，例如手机，电筒，相机等等都是充满之后才断电？还是因为电动工具自带的充电器电路设计不先进，不能很好地检测电池的容量状态？

这个是所谓紧凑型台锯或者说便携式台锯。保护装置在欧美应该是法律明文规定要装的，法规出台后出厂的产品都应该有。

不错，等有货再收来玩。

我用 B&D 20V Max 系列的工具，有快慢两种充电器可选。快充的电流大。

一般都设计成充满后断电，包括手机笔记本，但笔记本能通过软件让它只充80％（我松下就有，ibm好像也有），而手机因为看得到充到多少所以能自己控制别让充满（当然手机经常换，管他呢）。电动工具电池，至少得伟的没那么高级，看不到充电进度，所以都没法认为控制。

放电也是，虽然机器内部有过放保护，但最好也是别放光了再充。

勿充满勿放完，这个你可以去搜一下（好像举了个NASA的例子），这样做可以大大延长锂电池寿命。
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我看了好像松下电动工具的充电器最强大，好大一个，很多led显示。

得伟这个太差了，充电没进度条，电池余量也没显示，只有一档充电
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正规渠道蛮贵的，有地方能买到100。

手机其实无所谓，用不了两年都，那些能用3年以上的，才值得去关注电池，所以电动工具我认为还是值得的（至少别用完是能做到的）
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电池不需充满 “锂电池放电放得越尽，电池的损耗就会越大，” 艾克郎大学，帮助美国太空总署NASA研究延长 电池寿命的电子工程教授TomHartley，说到，“ 给电池充电充得越满，电池的损耗也会越大。锂 电池最好是处于电量的中间状态，那样的话电池 寿命最长。” 哈勃太空望远镜上电池的消耗电量设定在总容量 百分之１０，电池充放电循环次数可达１０万次 首先，过高和过低的电量状态对锂电池的寿命有 最不利的影响，而充放电循环次数反而是次要的 。其实，大多数售卖电器或电池上标识的可反复 充电次数，都是以放电百分之８０为基准测试得 出的。实验表明，对于一些笔记本电脑的锂电池 ，经常让电池电压超过标准电压0.1伏特，即从4. 1伏上升到4.2伏，那么电池的寿命会减半，再提 高0.1伏，则寿命减为原来的３分之一；长期低 电量或者无电量的状态则会使电池内部对电子移 动的阻力越来越大，于是导致电池容量变小。美 国宇航局NASA让其哈勃太空望远镜上电池的消 耗电量设定在总容量的百分之１０，以确保电池 可以反复充放电１０万次而不必更新。 其次，温度对锂电池寿命也有较大的影响（手机 和其他小型电子设备对此点可忽略）。冰点以下 的环境有可能使锂电池在电子产品打开的瞬间烧 毁，而过热的环境则会缩减电池的容量。因此， 如果笔电长期使用外接电源也不将电池取下来， 电池就长期处于笔记本排出的高热当中，更主要 的是，电池长期处于百分之１００的电量状态， 很快就会报废（包括我自己的笔电电池就是这么 玩完的）。 由以上，我们可以总结出以下几点确保锂电池容 量和寿命的注意事项： 不需要将锂电池充到百分之１００满电，更不 要将电量使用殆尽。在情况允许的情况下，尽量 使电池的电量维持在半满状态附近，充电与放电 的幅度越小越好； 通用ChevyVolt电动车的出厂设计就是强制将电 池电量维持在２０％至８０％，而苹果笔电的内 置电池可能也是运用了这一方法（包括其他一些 笔电和电子产品），让电池的可充放电周期数增 加。 不要将锂电池（尤其是笔记本锂电池）长期在 设备使用外接电源的情况下工作。就算您的笔记 本散热良好，长期百分之１００的电量就等于对 锂电池的谋杀。 1.如果你长期用外接电源为笔记本电脑供电，或 者电池电量已经超过８０%，马上取下你笔记本 的电池、平时充电不需将电池充满，充至８０％ 左右即可；调整操作系统的电源选项，将电量警 报调至２０％以上，平时电池电量最低不要低于 ２０％，在下降到２０％以前即要进行充电； 2.手机等小型电子设备，充好电了就应立刻断开 电源线（包括充电功能的USB接口），一直接着 会损害电池；要经常充电，记起来就充，但不必 非得把电池充满； 3.无论是对笔记本还是手机等，都一定不要让电 池耗尽； 4.如果要外出旅行，把电池充满吧，但请记得在 条件允许的情况下随时为电器充电，为了电池寿 命，一定不要等到电池放干； 现今人们都拥有不少电子设备，其中很大一部分 使用锂电池，确保电池寿命非常实用。毕竟电池 报废了还要回收处理，否则就会对环境造成严重 污染。
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前几天美亚发邮件给我了，说是还要30天。

电动工具充电器都是快充。
松下的别看 LED 多，也只是显示不同状态，如电池充不进，正在充电，充电完毕。充电也只有一档快充。至少我的松下电动工具的充电器是这样的。

盒子还不错，就跟放缝纫针的盒子一样，可以转着抽出某一只批头