[*thomas james]

aaa

[AuRavelling79]

That is the same symptoms as a flat/duff battery.

Lift it up and if the little light underneath is blinking than it's deffo battery.

[geefree]

it will also do it when charge is low.

[tas]

had same problem it was the battery charger not charging .fully charge the batt and test it with a voltmeter should be 13.6 volts when fully charged , ive now done away with the rubbish charger they supply with the backpack and bought one for motorbike batterys its great cost about 40 quid from hein gericke

[Richy L]

i had a problem with my backpack about 4-5 months ago. It turned on ok, then it would turn on and off ove and over again.  like it was stuttering. I put it down to a duff battery, but it works fine now with the same battery. I think it just got too wet, and needed to dry out

[neil100]

The termainls on my battery were very slack and kept losing the connection. I nipped them tighter and I have not had a problem since.

Nel

[geefree]

Hi,

It does say in the manual for the backpack,... when the battery is running low, it will stop - start intermittenly, if you leave it five minutes it will work again for 5 mins....its simply telling you the battery needs charging.

Gary.