I have a 1962 D7 with a D14 engine in it, it needs a new battery which according to Haynes is a 6v 11a/h.
Any 11a/h batteries I have seen online won't fit into the approx 85 x 80mm space in the battery holder.
I must be looking in the wrong places, but does anybody know which battery fits?
Unless anybody knows better I have not seen any suitable sized 11 ah batteries. I do not see a problem in fitting a lower ah battery. There are several 8ah batteries available to fit in the battery box of a D7, I have an Exide B49-6 fitted to mine.
Does your bike really need a 11ah or was it specified by BSA as it would last longer without being charged.
I use the B49-6 [8a/h] and don't see a problem if generator is charging OK, especially as I won't be dong much night riding.
In the old days, if the bike was parked in the street at night, the parking light needed to be left on.
Look at the classic parts supplier Feked.com, they do one in the old black rubber case with lid, as well as the modern white plastic cased.
Sorry for threadjacking...but its kind of on-topic 😉
Is there a minimum recommended capacity for a Bantam's battery? Capacity (in ampere Hours) seems generally proportional to the physical size of the battery. I'd like to fit the smallest possible battery to my D1 (to hide it away as it was originally as direct lighting model). I can get a 1.2ah battery which, I think, I could hide under the fuel tank, or a 2.8ah battery that might just squeeze into the tool box.
Since the bike should operate without the battery at all, is the capacity that significant? Its not as if its needed to drive the a starter motor or provide power for the ignition - Its only there really to help the alternator out , as far as I understand.
I would plan to keep the battery off the bike and on a trickle charge if the bile isn't to be ridden for more than a few days.
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