[ltp] Batteries for R52

[Henrique de Moraes Holschuh]

On Tue, 31 Oct 2006, Jaime Iniesta wrote:
> I need to buy a new battery for my R52. The old one is currently
> working but has not much capacity. I can't decide which one to buy:

Did you refresh it?  Charge it to full, and do a deep discharge (discharge
it until the embeded controller shuts the thinkpad off) twice in a row. Then
charge it to full again, and check its last_full_capacity reading to see if
it improved.

DO NOT DO THIS OFTEN.  Once or twice per battery pack *lifetime* is about
right :-)

It may give you up to 1000mAh back, if the problem is some battery
cristalization...  but this is an extremely optimistic scenario.

> The first one has 4800 mAh, is cheaper and weights 300 grams. The
> second one has 7200 mAh, is more expensive and has a weight of 500
> grs.

It also sticks out ~1.5cm from the back of a T43, I suppose it will do the
same in a R52.

> I would buy the second one if it lasts considerably more, but I don't
> like its weight. Do you think it's worth it? Does it really last much
> more than the first one?

The 9-cell battery does indeed last 150% (i.e. 50% more) than the 6-cell
one.   If your 6-cell used to last 2h when new, the 9-cell will last for
about 3h when new.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh