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Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 5:47 pm
by wibblywobbly
My electric drill Nicads finally decided not to hold a charge, and it was either buy new ones, or a new drill. Both options were expensive as I rarely use it. I then had a thought, two 7.2v Nimh batteries = 14.4v?

I pulled off the old Nicad unit, took the drill apart, and soldered a Tamiya connector onto the terminals inside the handle.
Then I soldered two Nimh batteries together in serial.

Plugged it in and it works. :D :D :D

I will make a neater job of it one day.

Only snag now is, can I charge a 14.4v battery pack from a 7.2v charger??

Re: Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 5:51 pm
by doc larsson
HECKLER KOCH ARRANGEMENT ?

Re: Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 6:00 pm
by RobW
Tape two chargers together? Worked for the batteries...... :D

Re: Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 6:21 pm
by jtracks
You must have Giant hands. :haha:

Re: Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 7:20 pm
by 971wright
Rob most smart chargers will do 14,4 volts if it will do a 4s lipo it will charge the 14,4


regards pete

Re: Never throw away those Heng Long batteries

Posted: Wed Aug 10, 2016 9:36 pm
by wibblywobbly
I only have a standard peak detect charger for Nimh's as I don't use Lipo's at all.

(Love the tape two chargers comment - lolol)

My guess is that if my chargers detects 8.4v then it won't charge 14.4v. The other option is to use a link cable in place of solder so that I can unlink them and charge them seperately.

Re: Never throw away those Heng Long batteries

Posted: Thu Aug 11, 2016 12:07 am
by 971wright
Hi Rob some Nihm packs go upto 14,4 v give it a try on the peak charger will either work or start alarm beeping,dont think you can damage either.


regards pete