lead acid battery

[starcraft_azzkikr]

okay i have a problem w/ a lead acid battery. the thing got totally diswcharged and it just is charging up to 3.3 v/ in 2 days. what is up w/ this. well i think it's a lead acide battery it's for my laptop it's a pb100. they originnaly had lead acid batts in them but maby this one is an nimh batt. i dunno. i have read everyhting about these two batts and if it is a leadacid it isn't supposed to hold any charge at aall. iut has been discharged for about 1-2 years now. i it's a 7.5 v batt. would you suggest that i just get anohter batery? i'm going to more than likemy buy one of those huge 20 dollar lead acid batts and just haul it around.what you guys think?

SA

[Richard_Cranium72]

Lead Acid batteries typically grow a white residue on the plates if allowed to discharge slowly. This powder is called sulfation. 1. You can try to shock the battery with double the volts normally used to charge it, CAUTION, do it in a blast proof container because if the battery is totally shorted out on the bottom of the plates it could explode. or/and 2. Try using a 9v power supply like the ones used on cordless phones etc, the sub-1 amp models. Important, cycle the charges by discharging the battery and re-charging it several times. I solder a small light bulb of the approx same voltage to a couple of insulated wires and simply place them on the terminals till the lamp lights and leave it on till very dim. Several times will build up the battery over several days. The factory charger for the batt probably is automatic and will not arrive at full charge after the battery ages. Even the ones with "refresh" seem to do a so-so job of draining the batt. If it is a Nickle Metal or Ni-Cad these will build a "Memory" and it is mandantory to discharge these before charging. btw, The new Lithium Ion batteries do not hold a memory and can be charged at any point in the discharge cycle. hope this helps, DrVette

[tonym]

Listen to DrVette!

If the battery has been discharged for 2+ years, then it is finished, dead, toes-up!!

Don't risk life-and-limb in the futile attempt to rescue it. Dispose of it and buy a new one. And if you've been trying to charge it recently, please take it outside to a well-ventilated location as you will have some hydrogen gas released as a deep charge event byproduct.

Just say no!!! Let if go...


Tony