SOHC.co.uk Forums > CB350/400

batterie 400f

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gtmdriver:
As Bryanj mentioned the regulator/rectifier combination on these early bikes is pretty crude so I would stick with either a traditional lead/acid or possibly an AGM. Gel, and particularly lithium batteries need a very specific and well controlled charging regime.

flatfour:
I've used a Motobatt on the CB750 for some three years now with complete satisfaction.

Moorey:
Rather than leaving on so called smart chargers for long periods of time you would be better off removing them   putting them on charge for 24hrs then check periodically when they get down to 12.1v  put them back on charge for 24hrs.
My 6v  yuasa bog standard lead acid is well over 10 years old and the one on the 750 is now over 5 years old and when I bought the bikes was told both times I would more than likely need a new one.

K2-K6:
As above,  I charge them slowly especially if they've been drained below optimum. 

I've an old (30years) Gunson trickle charger that'll get most batteries back up if the cells are OK.  It's only 0.8amp which you can leave on for a day or so to massage it back to full charge. It's just a plug type,  no guage,  nothing but a pair of leads and a 6/12volt switch to cope with all battery types  ;D

One consideration if you are storing in very low temps (freezing) a battery with very low charge level will by at risk of freezing the acid,  but much more resistant at full charge level. That can definitely kill individual cells and cause internal damage.

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