Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Jun 23, 2014, 04:02 AM
Registered User
Joined Jun 2014
1 Posts
Discussion
Rechargeable Batteries Charging Time

Hi,

(A) I have used 6 AA (total 7.2 V) batteries in a kid’s toy (Contest F1 Racing Car; 1/10th Scale, No.: 6643 ). Pls find battery details below:

1. Sony rechargeable batteries / Cycle Energy Multi-Use Premium Rechargeable Battery (Ni-MH AA, Pre-charged 2500 mAh; Model no.: NH-AA-B2GN).

2. All 6 batteries are connected by Kyosho / Tamiya Connectors.

I would like to know:-

1. How long I will have to charge all these 6 batteries with:

(a) The charger / adapter provided with that toy (Model: YX-3515A8, Input: AC 220V 50/60 Hz, Output: DC 7.2V 250 mA). Batteries (6) provided with this charger (L J BATTERY RA07d AA 500mAh 7.2V; these 6 cells are not so good quality).

(b) The charger / adapter I made with the help of a technician for the better performance / result (Model: DJ-E060500, Input: AC 230V 50/60 Hz, Output: DC 6V 500 mA).


(B) I have used 4 AA (total 4.8 V) batteries in a kid’s toy (Jeep, Military Corps Special, Cross Country, 1:16 Scale, No.: 360A). Pls find battery details below:

1. Sony rechargeable batteries / Cycle Energy Multi-Use Premium Rechargeable Battery (Ni-MH AA, Pre-charged 2100 mAh; Model no.: NH-AA-B2KN).

2. All 4 batteries are connected by 2 pin JST Connectors or Male Connector w / Wire for 1 / 18 Battery C22630 (may be / I am confused); pls find attachment for the pic of that 2 pin Connector in Adapter side or pls check this link http://www.integy.com/st_prod.html?p...6#.U6Ya2bEmETg .

I would like to know:-

1. How long I had to / will have to charge all these 4 batteries with:

(a) The charger / adapter provided with that toy (Model: XD-048250, Input: AC 220-240V 50/60 Hz, Output: DC 4.8V 250 mA). Batteries (4) provided with this charger (Model unknown; these 4 cells are not so good quality and already out of order).

(b) The charger / adapter I made with the help of a technician for the better performance / result (Model: PH-0450500 UP, Input: AC 220V 50 Hz, Output: DC 4.5V 500 mA).

(C) What is the charging time for rechargeable AA batteries (separate 02 / 03 pcs) when it is used several times earlier not the first time.

(D) What about AAA / 9V batteries in the above cases!

(E) Does pre-charged Sony Ni-MH AA batteries need to charge before use!

Thanks
tutul1717 is offline Find More Posts by tutul1717
Last edited by tutul1717; Jun 23, 2014 at 04:08 AM.
Reply With Quote
Sign up now
to remove ads between posts
Old Jun 23, 2014, 08:38 AM
PGR
Low AltiDude
PGR's Avatar
United States, CA, Costa Mesa
Joined Jun 2004
7,845 Posts
Assuming that the battery packs are discharged:

Charging a 2500mAh pack with a 250mA charger will take at least 10 hours (2500 / 250 = 10)
Charging a 2500mAh pack with a 500mA charger will take at least 5 hours (2500 / 500 = 5)
Charging a 2100mAh pack with a 250mA charger will take at least 8.4 hours (2100 / 250 = 8.4)
Charging a 2100mAh pack with a 500mA charger will take at least 4.2 hours (2100 / 500- 4.2)

BUT:

1.2V is the nominal voltage of a NiMH cell, but to charge it to 100% capacity will take around 1.6V per cell which will be 9.6V for a 6-cell pack and 6.4V for a 4-cell pack. The resting voltage of a fully-charged NiMH cell is around 1.4V per cell so the 6-cell pack will be at 8.4V and the 4-cell pack will be at 5.6V when fully-charged.

The bottom line is charging a 6-cell NiMH pack takes a charger with an output of at least 9.6V and charging a 4-cell NiMH pack takes a charger with an output of at least 6.4V. As long as the output current of the chargers are regulated, it doesn't matter if the output voltage is higher (within reason) because if the current is regulated, Ohm's Law will regulate the voltage for you.

Pete
PGR is online now Find More Posts by PGR
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion battery charge time robustini Batteries and Chargers 10 Oct 29, 2013 02:01 AM
Discussion "New charging method could greatly reduce battery recharge time." Miami Mike Batteries and Chargers 9 Mar 15, 2010 10:18 PM
Discussion charging time for Mystery 7.4V 900mAh 15C Lithium Polymer Rechargeable Battery hockmasm Micro Helis 8 Jul 01, 2008 08:14 PM
Discussion How to count the charging time of rechargeable battery? Olier Batteries and Chargers 0 Jun 12, 2007 02:02 AM