Have an unbranded lead-acid battery charger and a small 6Ah 12V battery. After about a year of purchasing the set I need to charge it for the first time. For car battery jump start I vaguely remember needing to reverse polarity of charging cable. In case of charing my little battery here what is the polarity to keep in mind while setting it up for charging?
closed as off-topic by Leon Heller, Daniel Grillo, Matt Young, placeholder, tcrosley May 13 '14 at 14:18
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Leon Heller, Daniel Grillo, Matt Young, placeholder, tcrosley
You DEFINITELY do not reverse polarities when charging.
Connect +ve to +ve (usually red jumper lead)
Connect -ve to-ve. (usually black jumper lead)
Doing it the other way round can damage the battery and/or the charger.
If connecting batteries together with jumper leads, a reversed polarity connection can lead to a battery exploding. An exploding wet battery can throw acid.
For long battery life most batteries will benefit from being charged more often than yearly. Battery capacity is slowly lost overtime and as voltage falls sulphation can occur.
Batteries are best not charged at a very high rate.
This is too complex a subject to deal with in a few lines but, as a guide, keeping charge rate below about C/5 is sensible. With a basic charger you may not be able to control or monitor charge rate. For this sort of application other factors will probably have the major effect on battery life and improper charging rate is probably a minor nail in the coffin of battery lifetime.
Lecture: Lead-acid batteries ECEN 4517/5517.
EECE Colorado Interesting
Powerstream Charging basics