No part of a category
Never connect multiple batteries in series!!
Why shouldn't I put old and new batteries together in a remote control?
Below is the explanation:
In the case below, it concerns a customer with a scooter with 5 12Volt batteries, so a 60V scooter.
To give a quick example:
The charging voltage of a 60Volt lead acid charger is: 73,5 Volt.
So if there are 5 identical batteries in series, each battery will be charged with: 73,5 / 5 = 14,7 Volts.
The recommended charging voltage for cyclic batteries is 14,5 – 14,9 Volts, so that's fine.
Because the batteries are connected in series, the same current will flow through all of them.
Ohm's law is V = I x R – voltage = current x resistance. Because the resistance is fixed and the current is the same everywhere (series connection), the voltage across the different blocks will vary.
The internal resistance of a CPC33-12 is approximately 12 mΩ, of a CPC38-12S it is approximately 8 mΩ
The voltage distribution over the batteries is then: 12+12+12+8+8 = 52
The CPC33-12 battery – 73,5 / 52 * 12 = 16,96 V
The CPC38-12S battery – 73,5 / 52 * 8 = 11,31 V
So one battery breaks because it gets a WAY too high charging voltage and the other breaks because it is never fully charged.
Below is the explanation:
In the case below, it concerns a customer with a scooter with 5 12Volt batteries, so a 60V scooter.
To give a quick example:
The charging voltage of a 60Volt lead acid charger is: 73,5 Volt.
So if there are 5 identical batteries in series, each battery will be charged with: 73,5 / 5 = 14,7 Volts.
The recommended charging voltage for cyclic batteries is 14,5 – 14,9 Volts, so that's fine.
Because the batteries are connected in series, the same current will flow through all of them.
Ohm's law is V = I x R – voltage = current x resistance. Because the resistance is fixed and the current is the same everywhere (series connection), the voltage across the different blocks will vary.
The internal resistance of a CPC33-12 is approximately 12 mΩ, of a CPC38-12S it is approximately 8 mΩ
The voltage distribution over the batteries is then: 12+12+12+8+8 = 52
The CPC33-12 battery – 73,5 / 52 * 12 = 16,96 V
The CPC38-12S battery – 73,5 / 52 * 8 = 11,31 V
So one battery breaks because it gets a WAY too high charging voltage and the other breaks because it is never fully charged.
