 Battery charging times

sshrinivasan

New Member
Hi all

I'm just trying to figure out how long to charge my battery to reach 80%. Its a 48V 19.2 Ah battery. The current readout is 47.1V. I got totally lost in another thread discussing the chemistry behind all the batteries. can someone do a simple explainer on what numbers do I use from my LCD readout, and how to compute the charging time using the stock 2 Ah charger?

sshrinivasan

New Member
My current plan is as follows. 1. From the graph, find the current depletion percentage. 47.1V is around 50%
2. 50% of 19.2 ah is 9.6Ah
3. I need to get to 80% of 19.2 Ah, i.e 15.4ah
4. (15.4 - 9.6) / 2 = 2.9 hours

Is this right?

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Bruce Arnold

Well-Known Member
You might try the empirical method.

1. Get a multi-meter (they come cheap so no sweat.)
2. Check the voltage prior to plugging it in.
3. Let it charge for a while. 3, 4, 5 hours.
4. Check the voltage again.
5. Subtract starting voltage from ending voltage and divide by hours. Now you have a fair idea of volts per hour.
6. In the future, decide how many volts you want to add and put it on the charger for X number of hours.
7. It's not as precise as a Satiator charger but costs about 2 percent of the price.

sshrinivasan

New Member
In the future, decide how many volts you want to add and put it on the charger for X number of hours.
Thats one thing I'm not sure about. Does the graph above seem accurate, i.e 80% is 51.5V for a 48V battery? Also is charging uniform, i.e is that battery charged the same amount each hour?

Justin Fischer

Member
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