I asked the UK distributor for the battery detail who asked the manufacturer and the answer was, 'You cannot change the batteries.' The manufacturer wouldn't even give the battery make/model. Then, I searched and searched the net and the only place I came anywhere near to finding out about changing the batts was on a Harley Davidson forum. But, despite trying to contact them, there was no contact.
I am trying to open the beggars at the moment. The fasteners look like mini pan head socket screws but I have a complete metric+imperial set of allen keys and nothing fits. Taking them home today to see if any of my friends have some special size of key that will open them. I found nothing on the internet about opening the SPH10 (which is what is supplied to the British marine market). There are some posts on the motorcycle forums about opening up other Sena models and they speak of using "star" bits which I think is what the Americans call Torx. But these don't look anything like a Torx.
If you do manage to get them apart, the technology isn't rocket science.
It could be a "Tri-Wing" screw driver fitment like on some hand held games console's, they are small. Cheap as chips on ebay. or here Nintendo Console Screwdriver (Tri Wing)
I think you'll find this whole thread agrees SENA is a good design, but that since the batteries cannot be changed, they are throw away units. Some of us have found the batteries are useless in next to no time, whilst some find them to be OK. After considerable fuss in chasing non-existent replacement batteries (and the manufacturers saying the batts cannot be replaced) I've thrown my Sensas away and replaced with with EarTecs - which have replacement batteries - YES!
I'm guessing these MapisM Eartec | Marine | Wireless | Headsets - Headset | Communication | Eartec Co
I bought them from Nymrod Comms. Good and quick service. Due lockdown in Guernsey, I've only used them around the house and (large) garden. No probs and no drop out. Bought the 3 person system. When flying, I preferred both ears covered giving me the choice whether to move one earpieces off-ear. Works well.
Using mobile phones does make sense. Full duplex and would work fine for 2 people I think.
I assume you're suggesting that for the mobile phone option? It has a hard-wired 3.5mm jack so might work for phones which have a suitable socket. But it's not water resistant - and if using a mobile phone you've got to be sure that's not going to go "plop!" into the drink. Just to make sure nobody is confused, the Aldi headsets are NOT duplex wireless transceivers like the Sena.
I wasn’t expecting much for £4-99 each.
I can't find that product, all I am seeing is kit that would not work for crew moving about the boat and handling lines. Could you post a link please?
I have a pair of these and have had them for about five years , still working ok. I think the thing is to keep charging them all year, and not to leave them over winter without charge