Given the extent of the injuries in that video, there is no way in hell that that was a battery explosion. I can't see any way that a lithium battery could generate the power to cause injuries like that.
From TDM
https://www.dailymail.co.uk/news/article-13863369/How-Israeli-spies-stashed-explosives-Hezbollah-pagers-production-level-Mossad.htmlA former British Army bomb disposal officer explained that an explosive device has five main components: A container, a battery, a triggering device, a detonator and an explosive charge.
'A pager has three of those already,' explained the ex-officer, who spoke on condition of anonymity because he now works as a consultant with clients on the Middle East.
'You would only need to add the detonator and the charge.'
By the time of the attack, 'the battery was probably half-explosive and half-actual battery,' said Carlos Perez, director of security intelligence at TrustedSec.
'Looking at the video, the size of the detonation is similar to that caused by an electric detonator alone or one that incorporates an extremely small, high-explosive charge,' said Sean Moorhouse, a former British Army officer and explosive ordinance disposal expert.
The AR-924 pager ordered by Hezbollah, advertised as being 'rugged,' contains a rechargeable lithium battery, according to specifications once advertised on Gold Apollo's website before it was apparently taken down Tuesday after the sabotage attack. It could receive text messages of up to 100 characters.
But they were actually manufactured by BAC Consulting in Hungary.
Elijah J. Magnier, a Brussels-based senior political risk analyst, later said he spoke with Hezbollah members who had examined pagers that failed to explode.
The pagers appeared to receive a coded error message sent to all the devices that caused them to vibrate and beep for some 10 seconds.
When the user pressed the pager's button to cancel the alert, the explosives were detonated - a design that would ensure the pager was being held by the user at the time of the blast to inflict maximum damage.
That would explain many of the hand and face injuries as many were holding it up in front of their face to read the message
If they're got some unexploded pagers that could mean we could be seeing the insides of one soon.
Hezbollah has probably assigned a group of young children* to disassembling some as we speak.
*in case they're booby trapped