LiIons are a pain. I've got some for my 3400 and 2400 that still hold at least an hour's charge, and several for Lombards/Pismos/iBooks that are dead as hell.
I'm pretty sure that it's not entirely usage that's to blame, because I've had flat-dead, unused-for-months 2400 batteries come back where partially flat 2-days-out-of-service Lombard batteries would do nothing but provide endless aggravation by not charging or by randomly dying with varying charge levels remaining displayed.
I like to blame it on the relentless march toward more in the same/smaller package: with a higher battery capacity, it seems that service life/cycle count is markedly reduced. I personally would rather lose an hour of runtime than have to replace the damn $150 battery annually, but nobody asks me.
Anyway, the only real idea I've had is cracking the battery pack and desoldering the battery leads from the main PCB to force-reset the "smart" electronics onboard. Of course, those boards (and most other LiIon battery-based things) also have a "if the battery goes below X charge, DO NOT EVER RECHARGE AGAIN!" feature, which is irreversible once set. This safety is apparently to keep the batteries from exploding or whatever, but they seem to do that of their own accord anyways, so I don't see how it helps. But yeah, I tried this once, and it didn't help, so I got a new battery; recelling LiIons is often more trouble than it's worth, particularly with aforementioned safety.
I'm pretty sure that it's not entirely usage that's to blame, because I've had flat-dead, unused-for-months 2400 batteries come back where partially flat 2-days-out-of-service Lombard batteries would do nothing but provide endless aggravation by not charging or by randomly dying with varying charge levels remaining displayed.
I like to blame it on the relentless march toward more in the same/smaller package: with a higher battery capacity, it seems that service life/cycle count is markedly reduced. I personally would rather lose an hour of runtime than have to replace the damn $150 battery annually, but nobody asks me.
Anyway, the only real idea I've had is cracking the battery pack and desoldering the battery leads from the main PCB to force-reset the "smart" electronics onboard. Of course, those boards (and most other LiIon battery-based things) also have a "if the battery goes below X charge, DO NOT EVER RECHARGE AGAIN!" feature, which is irreversible once set. This safety is apparently to keep the batteries from exploding or whatever, but they seem to do that of their own accord anyways, so I don't see how it helps. But yeah, I tried this once, and it didn't help, so I got a new battery; recelling LiIons is often more trouble than it's worth, particularly with aforementioned safety.