Charging battery in cold climate

Lead-acid battery charging in cold weather

Charging Batteries at High and Low Temperatures 

When the temperature of the electrolyte increase or decreases, the charging voltage needs adjustment from the usual setting/practices. For a full charge or float charge, a correction is required in the set voltage. At low temperature like -10 ⁰ C, the voltage setting has to be higher to compensate for the sluggish response to charging. Similarly, at high temperatures like 40⁰ C, the reactions are faster and need a lower charge and float voltages are to be set. THIS IS CALLED TEMPERATURE COMPENSATION. See the table below.

The following table gives the approx voltages to which a lead-acid cell should be charged at different temperatures

Temperature - Deg Centigrade Top up Charge voltage/cell Float Charge voltage/cell
-20 2.58 2.39
-10 2.52 2.30
0 2.50 2.29
10 2.48 2.28
20 2.45 2.28
30 2.42 2.25
40 2.39 2.22
50 2.36 2.22

These are ‘safe' temperatures for lead-acid battery charging

Share this article if you liked it, on

Share on facebook
Share on twitter
Share on reddit
Share on linkedin

Check out our complete range of batteries

Read more related articles

E Rickshaw in rural India

Erickshaw batteries

These vehicles are 3 wheelers pulled by an electric motor ranging from 650-1400 watts. They are mostly manufactured in India and China. Most have a mild steel tubular chassis with a differential mechanism at the rear wheels.

Read More »
SMF 12v 33AH

VRLA Batteries – Explained

The term sealed maintenance free or SMF means that water additions are not required over a VRLA battery’s guaranteed lifetime. Most VRLA batteries will still need some maintenance such as cell balancing, connection tightening

Read More »
Scroll to Top