Diagnosis of battery failure

Automotive lead-acid battery capacity will often appear lower self-discharge, excessive consumption of electrolyte and other faults. For these failures, observation can be used to diagnose.
First check the externally. Shell should be no large cracks, no leakage; electrolyte liquid is too low will lead to spillover, but also lead to reduced battery capacity. Surface should be clean, pole for corrosion, the positive lead (FireWire) should be insulated well, or will cause self-discharge phenomenon. There should be no loose joints, grounding should be solid, or increase the output impedance will reduce the output power. Then turn on headlights check. If white light is off, the battery is normal; if dark red, it indicates that power is low.
Then turn the starter. If the starter speed to normal, though slightly dim lighting, but there is still enough light, then a good, charge than the foot; If the starter seems weak, and the light becomes dark, then the battery from over discharge, should be immediately charged; If connected to the starter, the lights dimmed light, and immediately turn off the engine, then the battery discharge has exceeded the limit or plate has a serious curing.
If a fully charged battery with a good first day, over night and then they are using electricity, then the short-circuit the battery or circuits or serious self-discharge phenomenon.
After the initial examination, the electrolyte fluid level should be observed. If necessary, add distilled water. If confirmed the loss of electrolyte, the corresponding density of the electrolyte should be added.
For battery failure, once discovered, should be excluded. casing cracks, leaks, repair should be removed, otherwise it will lead to early battery scrap, but also severe corrosion of other auto parts; save battery power shortage, should be promptly charged; internal self-discharge exist, or vulcanization of the plate severe Batteries should be removed for inspection. If the problem is serious and should test new ones.